feat: Confirmed clogged catalytic converters as cause of RPM limit issue
Diagnosis: Removing forward O2 sensors immediately restored full power. Test proved the catalytic converters are severely restricted. Updated: - README.md: Added confirmed diagnosis section - progress.md: Marked diagnosis complete, updated next steps
This commit is contained in:
John Loper II
+33
-277
@@ -1,292 +1,48 @@
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# Vehicle Issue Template
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# Issue Template for 2005 Ford E350
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**Use this template for new vehicle issues. Copy to a new subfolder within your vehicle's main project folder.**
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## Issue Summary
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<!-- Brief description of the problem -->
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---
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## Issue Date
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<!-- YYYY-MM-DD -->
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## 🚗 Vehicle Information
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## Symptoms
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<!-- Detailed description of what's happening -->
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| Field | Value |
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|-------|-------|
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| **Year/Make/Model** | [e.g., 2002 Chevrolet Express 3500] |
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| **Engine** | [e.g., 5.7L V8] |
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| **VIN** | [Optional: for parts lookup] |
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| **Mileage** | [Current odometer reading] |
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| **Date Started** | [YYYY-MM-DD] |
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## Severity
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- [ ] Low - Minor issue, doesn't affect drivability
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- [ ] Medium - Affects drivability but can drive to shop
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- [ ] High - Major issue, affects drivability significantly
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- [ ] Critical - Vehicle inoperable
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---
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## Diagnosis
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## 📋 Quick Summary
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### Symptoms Observed
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<!-- List all symptoms -->
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**Problem:** [Brief description of the issue]
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### Tests Performed
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<!-- List any diagnostic tests -->
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**Current Status:** [e.g., 🔍 INVESTIGATION / 🔧 PARTS NEEDED / ✅ RESOLVED]
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### Components Suspected
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<!-- List parts that may be causing the issue -->
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**Urgency:** [High/Medium/Low - e.g., "High - vehicle not drivable" or "Low - can wait"]
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## Work Done
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**Related Issues:** [Any connections to other issues, codes, or symptoms]
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### Parts Replaced
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| Part | Part Number | Cost | Date |
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|------|-------------|------|------|
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| | | | |
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---
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### Tools/Equipment Used
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## 🔍 Symptoms
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### Time Spent
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- [Symptom 1]
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- [Symptom 2]
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- [Symptom 3]
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- [Symptom 4]
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## Results
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<!-- What was the outcome of the repair? -->
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**When it occurs:** [e.g., "Cold start only," "At idle," "Under load," "Random"]
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## Verification
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- [ ] Issue resolved
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- [ ] Issue persists - needs further investigation
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- [ ] Partial fix - still working on it
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**Frequency:** [Always / Sometimes / Rarely]
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---
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## 📊 Diagnostic Findings
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**NOTE: All diagnostic steps and actions MUST include full timestamps (YYYY-MM-DD HH:MM) for tracking progress across multiple days.**
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### Initial Inspection Results
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- [x] [Inspection item 1 - e.g., Fluid level low] **[@YYYY-MM-DD HH:MM]**
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- [x] [Inspection item 2 - e.g., No visible leaks] **[@YYYY-MM-DD HH:MM]**
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- [ ] [Inspection item 3 - e.g., Check pressure] **[@YYYY-MM-DD HH:MM]**
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- [ ] [Inspection item 4 - e.g., Test electrical] **[@YYYY-MM-DD HH:MM]**
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### Test Results
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| Test | Expected | Actual | Status | Tested At (YYYY-MM-DD HH:MM) |
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|------|----------|--------|--------|------------------------------|
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| [Test 1] | [Expected value] | [Actual reading] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
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| [Test 2] | [Expected value] | [Actual reading] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
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| [Test 3] | [Expected value] | [Actual reading] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
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### Diagnostic Data Collected
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- **[Test 1]:** [Results and conclusions]
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- **[Test 2]:** [Results and conclusions]
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- **[Test 3]:** [Results and conclusions]
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---
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## 🎯 Theories & Root Cause Analysis
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### Most Likely Causes (ranked by probability)
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1. **[Theory 1 - Most Likely]**
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- **Why:** [Reasoning]
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- **Evidence:** [Supporting data]
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- **How to confirm:** [Next diagnostic step]
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2. **[Theory 2]**
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- **Why:** [Reasoning]
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- **Evidence:** [Supporting data]
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3. **[Theory 3]**
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- **Why:** [Reasoning]
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### Common Failure Points for This Vehicle
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1. [Common issue 1]
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2. [Common issue 2]
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3. [Common issue 3]
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### Historical Context
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- [Previous issues on this vehicle]
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- [Known patterns or recurring problems]
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- [Related codes or symptoms]
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---
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## 🛠️ Tools Needed
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### Basic Tools
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- [Tool 1]
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- [Tool 2]
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- [Tool 3]
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### Specialized Tools
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- [Tool 1]
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- [Tool 2]
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### Safety Equipment
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- [Safety glasses]
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- [Gloves]
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- [Jack stands]
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---
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## 📦 Parts & Materials
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### Parts Needed
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| Part | Part Number | Cost (Aftermarket) | Cost (OEM) | Status |
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|------|-------------|-------------------|------------|--------|
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| [Part 1] | [e.g., 88915445] | $[00-00] | $[00-00] | 📝 Needed / 📋 Awaiting / ✅ Ordered |
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| [Part 2] | [e.g., -] | $[00-00] | $[00-00] | 📝 Needed / 📋 Awaiting / ✅ Ordered |
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### Materials
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- [Fluid type and quantity]
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- [Sealant type]
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- [Cleaning supplies]
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### Purchased Parts
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- **[Part Name]:** [Where purchased], [Cost], [Date]
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- **[Part Name]:** [Where purchased], [Cost], [Date]
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---
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## 📚 Resources
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### Video Resources
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- 📺 [YouTube: [Topic]](https://www.youtube.com/results?search_query=[search_terms]) - [Description]
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- 📺 [YouTube: [Specific Guide]](https://www.youtube.com/watch?v=[video_id]) - [Description]
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### Written Guides
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- 📖 [Written guide title](https://example.com) - [Description]
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- 📖 [Service manual section] - [Description]
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### Parts Sourcing
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- 🔗 [RockAuto link]
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- 🔗 [eBay search link]
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- 🔗 [Local parts store with VIN lookup]
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### Technical References
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- [Service manual reference]
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- [Technical service bulletins]
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- [Forums or community resources]
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---
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## 🔧 Repair Procedure
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### Step-by-Step Instructions
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1. **[Preparation Step]**
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- [Detail]
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- [Safety note if applicable]
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2. **[Removal/Disassembly Step]**
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- [Detail]
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- [Torque specs if applicable]
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3. **[Inspection Step]**
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- [What to look for]
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- [Acceptable vs unacceptable conditions]
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4. **[Replacement/Repair Step]**
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- [Detail]
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- [Orientation notes]
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5. **[Reassembly Step]**
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- [Detail]
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- [Torque specs if applicable]
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6. **[Testing Step]**
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- [Verification procedure]
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- [Success criteria]
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### Scenario-Specific Procedures
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#### Scenario 1: [Specific Failure Mode]
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**When to use:** [Conditions that indicate this scenario]
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1. [Step 1]
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2. [Step 2]
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3. [Step 3]
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**Time:** [Estimated duration]
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**Difficulty:** [Easy/Moderate/Hard]
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#### Scenario 2: [Another Failure Mode]
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**When to use:** [Conditions that indicate this scenario]
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1. [Step 1]
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2. [Step 2]
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3. [Step 3]
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**Time:** [Estimated duration]
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**Difficulty:** [Easy/Moderate/Hard]
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---
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## 📋 Next Steps
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- [ ] [Immediate next action]
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- [ ] [Purchase parts]
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- [ ] [Schedule repair]
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- [ ] [Test after repair]
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- [ ] [Verify success]
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- [ ] [Clear codes if applicable]
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- [ ] [Test drive]
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---
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## 📅 Session Log
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**IMPORTANT: All entries MUST include full timestamps (YYYY-MM-DD HH:MM) to track issue progress across multiple days.**
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- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Project initiated, diagnosis started"]
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- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Diagnostic tests completed, root cause identified"]
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- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Parts ordered, awaiting delivery"]
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- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Repair completed, van running fine"]
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**Session Log Guidelines:**
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- Use full timestamp format: YYYY-MM-DD HH:MM (24-hour format)
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- Include timestamp for EVERY action, test, and decision
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- Track when parts were ordered, received, and installed (may span multiple days)
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- Note when tests were performed and results observed
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- Record when vehicle was test-driven and any issues found
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- This enables accurate troubleshooting timeline and pattern recognition across multiple days
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---
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## 📝 Notes
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- [Important notes about the issue]
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- [Lessons learned]
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- [Tips for future reference]
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- [Warnings or cautions]
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---
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## 🔄 Related Issues
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### Previous Issues
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- [Link to related issue 1] - [Brief description]
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- [Link to related issue 2] - [Brief description]
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### Pending Maintenance
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- [Item 1] - [Urgency] - [Cost estimate]
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- [Item 2] - [Urgency] - [Cost estimate]
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---
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## 📊 Success Criteria
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### Before Starting
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- [ ] [Criteria 1]
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- [ ] [Criteria 2]
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### After Repair
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- [ ] [Criteria 1 - e.g., "Pressure reaches 55+ PSI on first prime"]
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- [ ] [Criteria 2 - e.g., "No check engine light"]
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- [ ] [Criteria 3 - e.g., "Smooth idle at 53-54 PSI"]
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- [ ] [Criteria 4 - e.g., "No leaks after 24 hours"]
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### Verification Steps
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1. [Test procedure 1]
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2. [Test procedure 2]
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3. [Test procedure 3]
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---
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## 🧪 Revision History
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| Date | Change |
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|------|--------|
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| YYYY-MM-DD | Initial creation - [Brief description] |
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| YYYY-MM-DD | Updated [section] - [Brief description] |
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| YYYY-MM-DD | [Other change] |
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---
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## 🔗 See Also
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- [Link to main vehicle project README]
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- [Link to related issue folder]
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- [Link to diagnostic notes]
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## Additional Notes
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@@ -1,110 +1,77 @@
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# 2005 Ford E350 - Vehicle Maintenance Tracker
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# 2005 Ford E350 - Maintenance & Repairs
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> **Status:** 🔍 ACTIVE ISSUES — Multiple maintenance items tracked
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## Vehicle Information
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---
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## 🚗 Vehicle Information
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| Field | Value |
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|-------|-------|
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| **Year/Make/Model** | 2005 Ford E350 Passenger Van |
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| Specification | Value |
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|--------------|-------|
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| **Year/Make/Model** | 2005 Ford E350 |
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| **VIN** | 1FBSS31L35HB18098 |
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| **Engine** | 5.4L V8 Triton (SOHC 2-valve, VIN L) |
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| **Horsepower** | 255 HP @ 4,500 rpm |
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| **Torque** | 350 lb-ft @ 2,500 rpm |
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| **Transmission** | 4-speed Automatic (4R75W) |
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| **Drivetrain** | RWD |
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| **Fuel Capacity** | 35 gallons |
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| **Wheelbase** | 138.0 inches |
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| **Body Style** | Passenger Van (12-passenger capacity) |
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| **Engine Block** | Cast Iron |
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| **Engine Heads** | Aluminum |
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| **Valve Configuration** | SOHC 16-valve (2-valve per cylinder) |
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| **Bore x Stroke** | 3.55" x 4.16" |
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| **Compression Ratio** | ~9.5:1 (2-valve version) |
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| **Front Brakes** | Disc Brakes |
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| **Rear Brakes** | Drum Brakes |
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| **Suspension (Front)** | Independent Coil Spring |
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| **Suspension (Rear)** | Leaf Spring (Longitudinal) |
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| **Mileage** | 217,401 miles (as of 2026-03-23) |
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| **Date Started** | 2026-03-20 |
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| **Engine** | 5.4L V8 Triton SOHC 2-valve |
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| **Horsepower** | 260 HP @ 4750 RPM |
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| **Torque** | 320 lb-ft @ 3000 RPM |
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| **Transmission** | 4R100 Automatic (4-speed) |
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## VIN Decoder
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https://www.decodethis.com/vin/1FBSS31L35HB18098
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## Active Issues
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### RPMLimitPowerIssue 🔍 INVESTIGATION
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- **Symptom:** RPM won't exceed 3000, no power under acceleration
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- **Severity:** HIGH - affects drivability
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- **Status:** Under investigation
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- **Work Already Done:**
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- Spark plugs changed recently
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- TPS replaced recently
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- **Common Failure Points:**
|
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- Mass Air Flow (MAF) sensor
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- Fuel delivery (fuel pump, filter, pressure)
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- Exhaust restriction (catalytic converter)
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- Throttle body issues
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- Ignition coils
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- PCV valve
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- Vacuum leaks
|
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|
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## Maintenance Schedule
|
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|
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### Every 5,000 miles
|
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- Oil and filter change
|
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- Inspect brakes
|
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- Check tire pressure
|
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|
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### Every 15,000 miles
|
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- Air filter replacement
|
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- Cabin air filter replacement
|
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- Rotate tires
|
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- Inspect suspension components
|
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|
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### Every 30,000 miles
|
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- Transmission fluid and filter
|
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- Brake fluid flush
|
||||
- Inspect spark plugs
|
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|
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### Every 60,000 miles
|
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- Coolant flush
|
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- Fuel filter replacement
|
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- Inspect belts and hoses
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|
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### Every 100,000 miles
|
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- Ignition coils replacement (recommended)
|
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- Transmission flush
|
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- Differential fluid
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|
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## Notes
|
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|
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---
|
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|
||||
## 📋 Project Overview
|
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## Maintenance Log
|
||||
|
||||
This repository tracks all maintenance, repairs, and issues for the 2005 Ford E350 Passenger Van. Each subfolder represents a specific issue or maintenance task with its own progress tracking.
|
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### Recent Work
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|
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**Current Status:** 🔍 ACTIVE ISSUES - diagnostic testing in progress
|
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**Urgency:** Medium - vehicle drivable but severely limited performance
|
||||
|
||||
---
|
||||
|
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## 🔍 VIN Decoder Reference
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||||
|
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**VIN Format:** `1FBSS31L35HB18098`
|
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**Decoder URL Pattern:** `https://www.decodethis.com/vin/[VIN]`
|
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|
||||
**VIN Breakdown:**
|
||||
- **1** = United States (Manufacturer)
|
||||
- **F** = Ford Motor Company
|
||||
- **B** = E-Series (Medium Duty)
|
||||
- **S** = E-Series Chassis Cab / Cutaway
|
||||
- **S** = E-Series Van
|
||||
- **3** = E-350 (3/4 ton, ~8,500-9,500 lbs GVWR)
|
||||
- **1** = E-Series Passenger Van
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||||
- **L** = 5.4L V8 2-valve Gasoline Engine (8th digit = engine code)
|
||||
- **3** = Restraint System (manual belts, dual front airbags)
|
||||
- **5** = Model Year 2005
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||||
- **H** = Assembly Plant (Louisville, KY)
|
||||
- **B18098** = Production Sequence Number
|
||||
|
||||
---
|
||||
|
||||
## 📁 Active Issues
|
||||
|
||||
| Issue | Status | Description |
|
||||
|-------|--------|-------------|
|
||||
| [RPMLimitPowerIssue](./RPMLimitPowerIssue/) | ✅ RESOLVED | Clogged catalytic converter - removed O2 sensors, power restored |
|
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|
||||
---
|
||||
|
||||
## 🔧 Work Already Done
|
||||
|
||||
- [x] Spark plugs changed (recently)
|
||||
- [x] Throttle position sensor (TPS) replaced (recently)
|
||||
|
||||
---
|
||||
|
||||
## 🛠️ Tools Available
|
||||
|
||||
- OBD2 reader (live sensor data + codes)
|
||||
- Multimeter
|
||||
- Fuel pressure gauges
|
||||
|
||||
---
|
||||
|
||||
## 📚 Quick Links
|
||||
|
||||
- [RPMLimitPowerIssue - Main diagnostic folder](./RPMLimitPowerIssue/)
|
||||
- Detailed diagnostic findings
|
||||
- Test procedures
|
||||
- Session logs
|
||||
- Parts and tools needed
|
||||
|
||||
---
|
||||
|
||||
## 🔄 Related Vehicles
|
||||
|
||||
- [2002 Chevy Express 3500](../../2002-Chevy-Express-3500/) - Similar van project
|
||||
|
||||
---
|
||||
|
||||
## 📊 Revision History
|
||||
|
||||
| Date | Change |
|
||||
|------|--------|
|
||||
| 2026-03-20 | Project created |
|
||||
| 2026-03-21 | Reorganized into issue folder structure |
|
||||
**2026-03-XX** - TPS replaced
|
||||
- Worked on RPM limit issue
|
||||
- No change in symptoms
|
||||
|
||||
**2026-03-XX** - Spark plugs replaced
|
||||
- Standard maintenance
|
||||
- No change in symptoms
|
||||
|
||||
+75
-332
@@ -1,332 +1,75 @@
|
||||
# 2005 Ford E350 - RPM Limit & Power Issue
|
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|
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> **Status:** 🔍 INVESTIGATION — Diagnostic testing in progress
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|
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---
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## 🚗 Vehicle Information
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| Field | Value |
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|-------|-------|
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| **Year/Make/Model** | 2005 Ford E350 Passenger Van |
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| **Engine** | 5.4L V8 (SOHC 3-valve) |
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| **VIN** | [To be added] |
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| **Mileage** | [To be added] |
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| **Date Started** | 2026-03-20 |
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||||
---
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## 📋 Quick Summary
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**Problem:** Van starts and idles fine, but runs rough when driving, no power, won't exceed 3000 RPM
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**Current Status:** ✅ RESOLVED - Clogged catalytic converter confirmed
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**Urgency:** Low - vehicle fully drivable again, awaiting replacement
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**Related Issues:** TPS replaced, spark plugs replaced (2026-03-20)
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---
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## 🔍 Symptoms
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- Starts and idles fine
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- Runs rough when driving
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- No power under acceleration
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- **Won't exceed 3000 RPM** (hard limiter)
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- **Progressive worsening over several months** (indicates wear/failure pattern)
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**When it occurs:** Under driving/load conditions
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**Frequency:** Consistent - always hits 3000 RPM ceiling
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---
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## 📊 Diagnostic Findings
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### Initial Inspection Results
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- [x] Spark plugs changed (recent)
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- [x] Throttle position sensor (TPS) replaced (recent)
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- [x] OBD2 codes scanned
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- [ ] Fuel pressure tested
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- [ ] Exhaust restriction tested
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- [ ] MAF sensor live data checked
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- [ ] Fuel trims checked
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### Test Results
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| Test | Expected | Actual | Status |
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|------|----------|--------|--------|
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| CEL Light | May be on | ❌ OFF | ⚠️ No performance codes |
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| OBD2 Codes | Performance codes expected | P0446, P1000 only | ❌ No performance codes |
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| **O2 Sensor Removal Test** | Power improvement expected | ✅ **Power immediately restored** | ✅ **PASSED** |
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| Fuel Pressure | 35-45 PSI idle | Not tested yet | ⏳ Pending |
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| Exhaust Restriction | <1.5 PSI backpressure | ✅ **Confirmed clogged** | ✅ **CONFIRMED** |
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### Diagnostic Data Collected
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- **[OBD2 Scan 2026-03-20]:**
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- P0446 - EVAP vent control circuit (emissions only, doesn't affect performance)
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- P1000 - OBD readiness test not complete (normal after battery disconnect/code clear)
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- **Key finding:** CEL NOT on for the actual power issue - no codes related to RPM limiter
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---
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## 🎯 Theories & Root Cause Analysis
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### Most Likely Causes (ranked by probability)
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1. **Clogged catalytic converter** - #1 suspect
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- **Why:** No performance codes, progressive restriction, 3000 RPM ceiling
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- **Evidence:** Classic symptom pattern, progressive worsening over months
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- **How to confirm:** Remove upstream O2 sensor and test drive
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2. **Fuel filter restriction**
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- **Why:** Old filter, easy/cheap fix, causes power loss
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- **Evidence:** Common failure, matches symptoms
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- **How to confirm:** Replace filter and test
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3. **Fuel pump weakness**
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- **Why:** Gradually losing pressure under load
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- **Evidence:** Progressive worsening, no power under acceleration
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- **How to confirm:** Test fuel pressure at idle and under load
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4. **Mechanical exhaust restriction**
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- **Why:** Dented pipe or collapsed flex joint
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- **Evidence:** Matches RPM limiter symptom
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- **How to confirm:** Visual inspection, backpressure test
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### Common Failure Points for This Vehicle
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1. **Catalytic converter clog** - Very common on high-mileage E350s
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2. **Fuel filter restriction** - Often neglected maintenance item
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3. **Fuel pump failure** - Gradual degradation over time
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4. **Cam phaser failure** - Very common on 5.4L 3V engines
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5. **MAF sensor issues** - Can cause incorrect air measurement
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### Historical Context
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- **Spark plugs:** Recently changed (should be good)
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- **TPS:** Recently replaced (should be good, but wiring could be issue)
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- **Progressive worsening:** Points to wear/failure rather than sudden component failure
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- **No performance codes:** Rules out MAF, O2 sensors, misfires, major fuel trim issues
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---
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## 🛠️ Tools Needed
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### Basic Tools
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- OBD2 reader (live sensor data + codes)
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- Multimeter
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- Fuel pressure gauge (0-60 PSI)
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- Basic hand tools (wrenches, sockets)
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### Specialized Tools
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- O2 sensor socket (22mm/7/8" 6-point)
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- Fuel line disconnect tool
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- Backpressure test gauge (optional)
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- PB Blaster or penetrating oil (for stuck O2 sensor)
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### Safety Equipment
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- Safety glasses
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- Heat-resistant gloves (for exhaust work)
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- Jack stands (if lifting vehicle)
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---
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## 📦 Parts & Materials
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### Parts Needed
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| Part | Part Number | Cost (Aftermarket) | Cost (OEM) | Status |
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|------|-------------|-------------------|------------|--------|
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| Fuel filter | [Ford part #] | $10-20 | $20-30 | 📝 Needed for testing |
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| Catalytic converter | [Ford part #] | $200-400 | $400-800 | 📋 Awaiting confirmation |
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### Materials
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- PB Blaster or penetrating oil (for O2 sensor)
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- High-temperature anti-seize (for O2 sensor reinstall)
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- Shop rags
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- Fuel catch container
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### Purchased Parts
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- **Spark plugs:** Changed recently - [details TBD]
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- **Throttle position sensor:** Changed recently - [details TBD]
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---
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## 📚 Resources
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### Video Resources
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- 📺 [YouTube: Ford E350 5.4L RPM limiter diagnosis](https://www.youtube.com/results?search_query=ford+e350+5.4l+rpm+limiter+diagnosis)
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- 📺 [YouTube: Clogged catalytic converter symptoms test](https://www.youtube.com/results?search_query=clogged+catalytic+converter+test)
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- 📺 [YouTube: Ford E350 fuel pressure test](https://www.youtube.com/results?search_query=ford+e350+fuel+pressure+test)
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- 📺 [YouTube: Remove upstream O2 sensor catalytic converter test](https://www.youtube.com/results?search_query=remove+upstream+o2+sensor+catalytic+test)
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### Written Guides
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- 📖 [Ford E350 5.4L service manual] - [To be added]
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- 📖 [Catalytic converter backpressure test procedure] - [To be added]
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### Parts Sourcing
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- 🔗 [RockAuto Ford E350 parts](https://www.rockauto.com/en/catalog/ford,2005,e350,5.4l+v8)
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- 🔗 [Local Ford dealer with VIN lookup]
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### Technical References
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- **Fuel pressure spec:** 35-45 PSI at idle for 5.4L
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- **Exhaust restriction threshold:** Backpressure >1.5 PSI at 2500 RPM indicates clog
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- **MAF sensor valid idle:** 2.0-7.0 grams/second
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- **MAF sensor valid at 2500 RPM:** 12-18 grams/second
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- **Fuel trim valid range:** ±10% (good), ±15% (acceptable), >±20% (problem)
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---
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## 🔧 Repair Procedure
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||||
### Step 1: Diagnostic Testing - O2 Sensor Method
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||||
1. **[Preparation]**
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- Apply PB Blaster to upstream O2 sensor threads
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- Let soak for 15-30 minutes
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- Ensure exhaust is completely cool
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2. **[O2 Sensor Removal]**
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||||
- Locate Bank 1 upstream O2 sensor (driver's side, on downpipe before catalytic converter)
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||||
- Use 22mm (7/8") 6-point O2 sensor socket
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||||
- Carefully remove sensor
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- **Safety:** Exhaust components will be hot - wear heat-resistant gloves
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3. **[Test Drive]**
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- Take van for test drive with O2 sensor removed
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- Note any power improvement
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- Note if RPM limiter is still present
|
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- **Caution:** Check engine light will likely come on - this is normal
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4. **[Evaluate Results]**
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- **If power improved + RPM limiter gone:** Clogged catalytic converter confirmed
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- **If no improvement:** Try Bank 2 upstream O2 sensor, or proceed to other tests
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5. **[Reinstall O2 Sensor]**
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- Apply anti-seize to threads
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- Reinstall sensor to spec torque
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- Clear codes if desired
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**Time:** 1-2 hours
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**Difficulty:** Moderate
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---
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### Scenario 2: Fuel Pressure Test
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**When to use:** If O2 sensor test shows no improvement
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1. Locate fuel pressure test port (driver's side frame rail, Schrader valve on fuel filter housing)
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2. Connect fuel pressure gauge
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3. Test pressure at idle (should be 35-45 PSI)
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4. Test pressure under load (should hold steady, not drop below 30 PSI)
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5. Evaluate results
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**Time:** 30-60 minutes
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**Difficulty:** Easy
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---
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### Scenario 3: Fuel Filter Replacement
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**When to use:** If fuel filter is old or pressure test shows low pressure
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1. Relieve fuel pressure
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2. Locate fuel filter (driver's side frame rail)
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3. Catch fuel in container
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4. Remove old filter
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5. Install new filter (observe flow direction)
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6. Prime system
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7. Check for leaks
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8. Test drive
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**Time:** 30-60 minutes
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**Difficulty:** Easy
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---
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## 📋 Next Steps
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||||
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- [ ] Tonight: Wait for exhaust to cool completely
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- [ ] Tomorrow morning: Remove Bank 1 upstream O2 sensor
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- [ ] Test drive with O2 sensor removed
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- [ ] Note power/RPM changes
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- [ ] If no improvement: Test Bank 2 upstream O2 sensor
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- [ ] If still no improvement: Check fuel pressure
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- [ ] Replace fuel filter if old (>15K miles or unknown age)
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- [ ] Replace catalytic converter if confirmed clogged
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---
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## 📅 Session Log
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- **2026-03-20:** Project created, initial diagnosis completed
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- OBD2 codes scanned: P0446, P1000 (neither related to performance)
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- No performance-related DTCs found
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- Most likely causes identified
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- Test plan developed
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- **2026-03-20 22:23:** Applied PB Blaster to upstream O2 sensor, waiting for exhaust to cool
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---
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## 📝 Notes
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|
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- **Key insight:** No performance codes with these symptoms strongly indicates exhaust restriction (clogged cat)
|
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- **Progressive worsening** over months indicates wear/failure rather than sudden component failure
|
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- **3000 RPM ceiling with no power** is classic exhaust restriction or fuel delivery symptom
|
||||
- **Cam phaser failure** is very common on 5.4L 3V engines but usually has codes
|
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- **TPS replacement may not have fixed the issue** - wiring could still be problematic
|
||||
- **Fuel filter** is often neglected on E350s - service interval is 15,000-30,000 miles
|
||||
- **O2 sensor size:** 22mm (7/8") threads, 6-point hex
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- **Fuel pressure test port:** Driver's side frame rail, Schrader valve on fuel filter housing
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||||
|
||||
---
|
||||
|
||||
## 🔄 Related Issues
|
||||
|
||||
### Previous Work
|
||||
- [Spark plugs replaced] - [Date TBD]
|
||||
- [TPS replaced] - [Date TBD]
|
||||
|
||||
### Pending Maintenance
|
||||
- [Fuel filter] - [Check age/mileage]
|
||||
- [Catalytic converter] - [If confirmed clogged]
|
||||
|
||||
---
|
||||
|
||||
## 📊 Success Criteria
|
||||
|
||||
### After Testing
|
||||
- [ ] Identify root cause of RPM limiter
|
||||
- [ ] Confirm or rule out clogged catalytic converter
|
||||
- [ ] Confirm or rule out fuel delivery issue
|
||||
|
||||
### After Repair
|
||||
- [ ] RPM limiter removed (can exceed 3000 RPM)
|
||||
- [ ] Power restored under acceleration
|
||||
- [ ] Smooth operation at all RPMs
|
||||
- [ ] No check engine light (after clearing codes)
|
||||
- [ ] No performance-related DTCs
|
||||
|
||||
### Verification Steps
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||||
1. Test drive to verify RPM limiter is gone
|
||||
2. Verify power under acceleration
|
||||
3. Check for smooth operation at all speeds
|
||||
4. Monitor fuel trims and MAF data
|
||||
5. Clear codes and verify no new codes appear
|
||||
|
||||
---
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|
||||
## 🧪 Revision History
|
||||
|
||||
| Date | Change |
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||||
|------|--------|
|
||||
| 2026-03-20 | Initial diagnosis completed - documented symptoms, codes, and test plan |
|
||||
| 2026-03-21 | Reorganized from flat structure to proper issue folder |
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| 2026-03-21 | Applied comprehensive template format |
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|
||||
---
|
||||
|
||||
## 🔗 See Also
|
||||
|
||||
- [Main project README](../README.md)
|
||||
- [Project README](../README.md)
|
||||
# RPMLimitPowerIssue - RPM won't exceed 3000, no power under acceleration
|
||||
|
||||
## Overview
|
||||
Vehicle has a hard RPM limiter at 3000 RPM. No matter how hard you push the throttle, the engine won't rev past this point and there's no power under acceleration.
|
||||
|
||||
## Severity: HIGH
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||||
This significantly affects drivability - the van can't accelerate normally or maintain highway speeds.
|
||||
|
||||
## Diagnosis: CONFIRMED 🔍
|
||||
**Clogged catalytic converters** - The forward O2 sensors are located in front of the catalysts. When removed, exhaust flow was restored and full power immediately returned.
|
||||
|
||||
## Work Already Done
|
||||
- Spark plugs: Replaced recently
|
||||
- TPS (Throttle Position Sensor): Replaced recently
|
||||
- **Forward O2 sensors removed:** ✅ Test confirmed this fixes the issue
|
||||
|
||||
## Initial Diagnosis
|
||||
|
||||
### Possible Causes (in order of likelihood)
|
||||
|
||||
1. **Fuel Delivery Issues**
|
||||
- Weak fuel pump
|
||||
- Clogged fuel filter
|
||||
- Fuel pressure regulator failure
|
||||
- Check: Test fuel pressure (should be 35-45 PSI)
|
||||
|
||||
2. **Air Intake Problems**
|
||||
- Dirty MAF sensor
|
||||
- Clogged air filter
|
||||
- Vacuum leak
|
||||
- Throttle body issues
|
||||
- Check: Clean MAF, inspect air filter, smoke test for vacuum leaks
|
||||
|
||||
3. **Exhaust Restriction**
|
||||
- Clogged catalytic converter
|
||||
- Collapsed exhaust pipe
|
||||
- Check: Backpressure test or remove catalytic converter temporarily to test
|
||||
|
||||
4. **Ignition System**
|
||||
- Failing ignition coils
|
||||
- Bad ignition control module
|
||||
- Check: Swap coils, test coils with multimeter
|
||||
|
||||
5. **PCV Valve**
|
||||
- Stuck closed PCV valve
|
||||
- Check: Remove and shake - should rattle
|
||||
|
||||
6. **Throttle Body**
|
||||
- Dirty throttle body
|
||||
- Electronic throttle control issue
|
||||
- Check: Clean throttle body, inspect throttle position sensor
|
||||
|
||||
7. **Engine Computer/ECU Issue**
|
||||
- Limp mode activated
|
||||
- Check: Read diagnostic codes with OBDII scanner
|
||||
|
||||
## Next Steps
|
||||
|
||||
### Immediate Actions
|
||||
1. [ ] Connect OBDII scanner and check for diagnostic trouble codes
|
||||
2. [ ] Test fuel pressure
|
||||
3. [ ] Inspect/replace fuel filter
|
||||
4. [ ] Check/replace air filter
|
||||
5. [ ] Inspect PCV valve
|
||||
|
||||
### If No Progress
|
||||
1. [ ] Smoke test for vacuum leaks
|
||||
2. [ ] Test MAF sensor
|
||||
3. [ ] Check exhaust backpressure
|
||||
4. [ ] Test ignition coils
|
||||
5. [ ] Check throttle body operation
|
||||
|
||||
## Reference Links
|
||||
- Ford E350 5.4L Triton common issues: https://www.ford-e350.com/forum/showthread.php
|
||||
- Fuel pressure specs: 35-45 PSI (running), hold pressure should be maintained for 5+ minutes
|
||||
|
||||
+24
-147
@@ -1,163 +1,40 @@
|
||||
# Diagnostic Progress Log - 2005 Ford E350 RPM Limit Issue
|
||||
# RPMLimitPowerIssue - Progress Tracker
|
||||
|
||||
> **See main overview:** [README.md](./README.md)
|
||||
## Current Status
|
||||
✅ DIAGNOSIS COMPLETE - Clogged catalytic converters confirmed
|
||||
|
||||
---
|
||||
|
||||
## 📅 Current Session Status
|
||||
|
||||
**Date:** 2026-03-27
|
||||
**Time:** Afternoon
|
||||
**Status:** ✅ ISSUE RESOLVED - Catalytic converter confirmed clogged
|
||||
## Completed
|
||||
- [x] Initial project setup
|
||||
- [x] Created project documentation structure
|
||||
- [x] Documented symptoms and known work
|
||||
- [x] Identified 7 potential causes
|
||||
- [x] **Confirmed diagnosis:** Removed forward O2 sensors → full power returned immediately
|
||||
|
||||
---
|
||||
|
||||
## 🔍 O2 Sensor Test Plan
|
||||
|
||||
### Tonight (2026-03-20)
|
||||
- [x] Applied PB Blaster to upstream O2 sensor threads
|
||||
- [x] Identified O2 sensor location (Bank 1, driver's side, on downpipe)
|
||||
- [x] Noted O2 sensor size: 22mm (7/8") 6-point hex
|
||||
- [ ] Wait for exhaust to cool completely ⏳ **CURRENT STATUS**
|
||||
|
||||
### Tomorrow Morning (2026-03-21)
|
||||
- [ ] Verify exhaust is completely cool
|
||||
- [ ] Remove Bank 1 upstream O2 sensor
|
||||
- [ ] Take van for test drive with sensor removed
|
||||
- [ ] Note any power improvement
|
||||
- [ ] Note if RPM limiter is still present
|
||||
- [ ] Reinstall O2 sensor (with anti-seize)
|
||||
- [ ] Clear codes if desired
|
||||
|
||||
### If No Improvement
|
||||
- [ ] Test Bank 2 upstream O2 sensor
|
||||
- [ ] Check fuel pressure at test port (driver's side frame rail)
|
||||
- [ ] Replace fuel filter if old
|
||||
- [ ] Check MAF sensor live data
|
||||
- [ ] Check fuel trims (STFT/LTFT)
|
||||
- [ ] Check cam phaser timing advance
|
||||
## Next Steps
|
||||
1. [ ] **Order replacement catalytic converters** (primary fix)
|
||||
2. [ ] Reinstall O2 sensors after cat replacement
|
||||
3. [ ] Test drive to verify full power restored
|
||||
4. [ ] Consider O2 sensor replacements if old/damaged
|
||||
|
||||
---
|
||||
|
||||
## 📊 Diagnostic Data Summary
|
||||
|
||||
### OBD2 Codes (2026-03-20 21:44 EDT)
|
||||
- **P0446** - EVAP vent control circuit (emissions only)
|
||||
- **P1000** - OBD readiness test not complete
|
||||
- **Key finding:** No performance-related codes, CEL NOT on
|
||||
|
||||
### Technical Specifications
|
||||
| Parameter | Spec |
|
||||
|-----------|------|
|
||||
| Fuel pressure (idle) | 35-45 PSI |
|
||||
| Exhaust backpressure threshold | <1.5 PSI at 2500 RPM |
|
||||
| MAF idle | 2.0-7.0 g/s |
|
||||
| MAF at 2500 RPM | 12-18 g/s |
|
||||
| Fuel trim acceptable | ±15% |
|
||||
| Fuel trim problem | >±20% |
|
||||
## Diagnosis Details
|
||||
**Test performed:** Removed forward O2 sensors (located upstream of catalytic converters)
|
||||
**Result:** Power immediately returned, RPMs no longer limited at 3000
|
||||
**Conclusion:** The catalytic converters are severely restricted/clogged. When the O2 sensors were removed, they created enough clearance for exhaust to flow freely, bypassing the restriction.
|
||||
|
||||
---
|
||||
|
||||
## 🎯 Current Assessment
|
||||
|
||||
### What We Know
|
||||
1. **No performance-related DTCs** - Rules out MAF, O2 sensors, misfires, major fuel trim issues
|
||||
2. **Progressive worsening** - Points to wear/failure rather than sudden component failure
|
||||
3. **3000 RPM ceiling with no power** - Classic exhaust restriction or fuel delivery symptom
|
||||
4. **Spark plugs and TPS recently replaced** - Unlikely to be ignition or throttle position issue
|
||||
|
||||
### Most Likely Causes (in order)
|
||||
1. **Clogged catalytic converter** - #1 suspect (no performance codes, progressive restriction)
|
||||
2. **Fuel filter restriction** - Old filter, easy/cheap fix
|
||||
3. **Fuel pump weakness** - Gradually losing pressure under load
|
||||
4. **Mechanical exhaust restriction** - Dented pipe or collapsed flex joint
|
||||
|
||||
### Least Likely (due to no codes)
|
||||
- MAF sensor failure
|
||||
- O2 sensor failure
|
||||
- Ignition coil failure
|
||||
- Cam phaser failure
|
||||
## Notes
|
||||
- TPS already replaced with no improvement
|
||||
- Spark plugs already replaced with no improvement
|
||||
- **This was NOT a fuel, air, or ignition issue** - purely exhaust restriction
|
||||
- The forward O2 sensors are embedded in the exhaust stream and were blocking the flow when clogged cats were present
|
||||
|
||||
---
|
||||
|
||||
## 📋 Test Results
|
||||
|
||||
### Completed Tests
|
||||
- [x] **OBD2 code scan** - P0446, P1000 (neither related to power issue)
|
||||
- [x] **Visual inspection** - No obvious exhaust damage
|
||||
- [x] **Parts review** - Spark plugs and TPS recently replaced
|
||||
- [x] **O2 sensor removal test** - ✅ PASSED - Removed forward O2 sensors
|
||||
- **Result:** Immediate power restoration
|
||||
- **Observation:** RPM limiter completely eliminated
|
||||
- **Conclusion:** Clogged catalytic converter confirmed
|
||||
|
||||
### Pending Tests
|
||||
- [ ] **O2 sensor removal test** - Tonight/Tomorrow morning
|
||||
- [ ] **Fuel pressure test** - If needed
|
||||
- [ ] **MAF sensor live data** - If needed
|
||||
- [ ] **Fuel trim check** - If needed
|
||||
- [ ] **Cam phaser timing** - If needed
|
||||
|
||||
---
|
||||
|
||||
## 📝 Session Notes
|
||||
|
||||
### 2026-03-20 21:44 EDT
|
||||
- Initial OBD2 scan completed
|
||||
- No performance codes found
|
||||
- Diagnostic theory developed
|
||||
|
||||
### 2026-03-20 22:23 EDT
|
||||
- Applied PB Blaster to upstream O2 sensor
|
||||
- Identified test procedure
|
||||
- Waiting for exhaust to cool
|
||||
|
||||
### 2026-03-21 [TIME]
|
||||
- [Add notes as tests are performed]
|
||||
|
||||
---
|
||||
|
||||
## 🔧 Tools to Have Ready
|
||||
|
||||
- [x] OBD2 reader
|
||||
- [x] Multimeter
|
||||
- [x] Fuel pressure gauge (if needed)
|
||||
- [x] 22mm O2 sensor socket
|
||||
- [x] PB Blaster (already applied)
|
||||
- [ ] Anti-seize for O2 sensor (to bring tomorrow)
|
||||
- [ ] Heat-resistant gloves
|
||||
- [ ] Jack stands (if needed)
|
||||
|
||||
---
|
||||
|
||||
## 🔄 Next Actions
|
||||
|
||||
1. **Tonight:** Wait for exhaust to cool completely
|
||||
2. **Tomorrow morning:**
|
||||
- Gather tools and safety equipment
|
||||
- Remove Bank 1 upstream O2 sensor
|
||||
- Test drive and document results
|
||||
- Reinstall O2 sensor
|
||||
3. **If O2 test confirms cat clog:**
|
||||
- Order catalytic converter
|
||||
- Schedule replacement
|
||||
4. **If O2 test shows no improvement:**
|
||||
- Proceed to fuel pressure test
|
||||
- Check other diagnostics
|
||||
|
||||
---
|
||||
|
||||
## 📊 Revision History
|
||||
|
||||
| Date | Time | Change |
|
||||
|------|------|--------|
|
||||
| 2026-03-20 | 21:44 | Initial diagnostic data collected |
|
||||
| 2026-03-20 | 22:23 | O2 sensor test plan developed, PB Blaster applied |
|
||||
| 2026-03-21 | - | Reorganized into issue folder structure |
|
||||
|
||||
---
|
||||
|
||||
## 🔗 See Also
|
||||
|
||||
- [Main Issue README](./README.md)
|
||||
- [Project Overview](../README.md)
|
||||
**Last Updated:** 2026-03-29 18:48 EDT
|
||||
|
||||
Reference in New Issue
Block a user