From 4e52c91c9b254344c69d742168293e83be36ac24 Mon Sep 17 00:00:00 2001 From: John Loper II Date: Sun, 29 Mar 2026 18:49:00 -0400 Subject: [PATCH] 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 --- ISSUE_TEMPLATE.md | 310 +++---------------------- README.md | 169 ++++++-------- RPMLimitPowerIssue/README.md | 407 ++++++--------------------------- RPMLimitPowerIssue/progress.md | 171 ++------------ 4 files changed, 200 insertions(+), 857 deletions(-) diff --git a/ISSUE_TEMPLATE.md b/ISSUE_TEMPLATE.md index b032685..bdb3ae1 100644 --- a/ISSUE_TEMPLATE.md +++ b/ISSUE_TEMPLATE.md @@ -1,292 +1,48 @@ -# Vehicle Issue Template +# Issue Template for 2005 Ford E350 -**Use this template for new vehicle issues. Copy to a new subfolder within your vehicle's main project folder.** +## Issue Summary + ---- +## Issue Date + -## ๐Ÿš— Vehicle Information +## Symptoms + -| Field | Value | -|-------|-------| -| **Year/Make/Model** | [e.g., 2002 Chevrolet Express 3500] | -| **Engine** | [e.g., 5.7L V8] | -| **VIN** | [Optional: for parts lookup] | -| **Mileage** | [Current odometer reading] | -| **Date Started** | [YYYY-MM-DD] | +## Severity +- [ ] Low - Minor issue, doesn't affect drivability +- [ ] Medium - Affects drivability but can drive to shop +- [ ] High - Major issue, affects drivability significantly +- [ ] Critical - Vehicle inoperable ---- +## Diagnosis -## ๐Ÿ“‹ Quick Summary +### Symptoms Observed + -**Problem:** [Brief description of the issue] +### Tests Performed + -**Current Status:** [e.g., ๐Ÿ” INVESTIGATION / ๐Ÿ”ง PARTS NEEDED / โœ… RESOLVED] +### Components Suspected + -**Urgency:** [High/Medium/Low - e.g., "High - vehicle not drivable" or "Low - can wait"] +## Work Done -**Related Issues:** [Any connections to other issues, codes, or symptoms] +### Parts Replaced +| Part | Part Number | Cost | Date | +|------|-------------|------|------| +| | | | | ---- +### Tools/Equipment Used -## ๐Ÿ” Symptoms +### Time Spent -- [Symptom 1] -- [Symptom 2] -- [Symptom 3] -- [Symptom 4] +## Results + -**When it occurs:** [e.g., "Cold start only," "At idle," "Under load," "Random"] +## Verification +- [ ] Issue resolved +- [ ] Issue persists - needs further investigation +- [ ] Partial fix - still working on it -**Frequency:** [Always / Sometimes / Rarely] - ---- - -## ๐Ÿ“Š Diagnostic Findings - -**NOTE: All diagnostic steps and actions MUST include full timestamps (YYYY-MM-DD HH:MM) for tracking progress across multiple days.** - -### Initial Inspection Results -- [x] [Inspection item 1 - e.g., Fluid level low] **[@YYYY-MM-DD HH:MM]** -- [x] [Inspection item 2 - e.g., No visible leaks] **[@YYYY-MM-DD HH:MM]** -- [ ] [Inspection item 3 - e.g., Check pressure] **[@YYYY-MM-DD HH:MM]** -- [ ] [Inspection item 4 - e.g., Test electrical] **[@YYYY-MM-DD HH:MM]** - -### Test Results - -| Test | Expected | Actual | Status | Tested At (YYYY-MM-DD HH:MM) | -|------|----------|--------|--------|------------------------------| -| [Test 1] | [Expected value] | [Actual reading] | โœ…/โŒ/โš ๏ธ | [YYYY-MM-DD HH:MM] | -| [Test 2] | [Expected value] | [Actual reading] | โœ…/โŒ/โš ๏ธ | [YYYY-MM-DD HH:MM] | -| [Test 3] | [Expected value] | [Actual reading] | โœ…/โŒ/โš ๏ธ | [YYYY-MM-DD HH:MM] | - -### Diagnostic Data Collected -- **[Test 1]:** [Results and conclusions] -- **[Test 2]:** [Results and conclusions] -- **[Test 3]:** [Results and conclusions] - ---- - -## ๐ŸŽฏ Theories & Root Cause Analysis - -### Most Likely Causes (ranked by probability) -1. **[Theory 1 - Most Likely]** - - **Why:** [Reasoning] - - **Evidence:** [Supporting data] - - **How to confirm:** [Next diagnostic step] - -2. **[Theory 2]** - - **Why:** [Reasoning] - - **Evidence:** [Supporting data] - -3. **[Theory 3]** - - **Why:** [Reasoning] - -### Common Failure Points for This Vehicle -1. [Common issue 1] -2. [Common issue 2] -3. [Common issue 3] - -### Historical Context -- [Previous issues on this vehicle] -- [Known patterns or recurring problems] -- [Related codes or symptoms] - ---- - -## ๐Ÿ› ๏ธ Tools Needed - -### Basic Tools -- [Tool 1] -- [Tool 2] -- [Tool 3] - -### Specialized Tools -- [Tool 1] -- [Tool 2] - -### Safety Equipment -- [Safety glasses] -- [Gloves] -- [Jack stands] - ---- - -## ๐Ÿ“ฆ Parts & Materials - -### Parts Needed -| Part | Part Number | Cost (Aftermarket) | Cost (OEM) | Status | -|------|-------------|-------------------|------------|--------| -| [Part 1] | [e.g., 88915445] | $[00-00] | $[00-00] | ๐Ÿ“ Needed / ๐Ÿ“‹ Awaiting / โœ… Ordered | -| [Part 2] | [e.g., -] | $[00-00] | $[00-00] | ๐Ÿ“ Needed / ๐Ÿ“‹ Awaiting / โœ… Ordered | - -### Materials -- [Fluid type and quantity] -- [Sealant type] -- [Cleaning supplies] - -### Purchased Parts -- **[Part Name]:** [Where purchased], [Cost], [Date] -- **[Part Name]:** [Where purchased], [Cost], [Date] - ---- - -## ๐Ÿ“š Resources - -### Video Resources -- ๐Ÿ“บ [YouTube: [Topic]](https://www.youtube.com/results?search_query=[search_terms]) - [Description] -- ๐Ÿ“บ [YouTube: [Specific Guide]](https://www.youtube.com/watch?v=[video_id]) - [Description] - -### Written Guides -- ๐Ÿ“– [Written guide title](https://example.com) - [Description] -- ๐Ÿ“– [Service manual section] - [Description] - -### Parts Sourcing -- ๐Ÿ”— [RockAuto link] -- ๐Ÿ”— [eBay search link] -- ๐Ÿ”— [Local parts store with VIN lookup] - -### Technical References -- [Service manual reference] -- [Technical service bulletins] -- [Forums or community resources] - ---- - -## ๐Ÿ”ง Repair Procedure - -### Step-by-Step Instructions - -1. **[Preparation Step]** - - [Detail] - - [Safety note if applicable] - -2. **[Removal/Disassembly Step]** - - [Detail] - - [Torque specs if applicable] - -3. **[Inspection Step]** - - [What to look for] - - [Acceptable vs unacceptable conditions] - -4. **[Replacement/Repair Step]** - - [Detail] - - [Orientation notes] - -5. **[Reassembly Step]** - - [Detail] - - [Torque specs if applicable] - -6. **[Testing Step]** - - [Verification procedure] - - [Success criteria] - -### Scenario-Specific Procedures - -#### Scenario 1: [Specific Failure Mode] -**When to use:** [Conditions that indicate this scenario] - -1. [Step 1] -2. [Step 2] -3. [Step 3] - -**Time:** [Estimated duration] -**Difficulty:** [Easy/Moderate/Hard] - -#### Scenario 2: [Another Failure Mode] -**When to use:** [Conditions that indicate this scenario] - -1. [Step 1] -2. [Step 2] -3. [Step 3] - -**Time:** [Estimated duration] -**Difficulty:** [Easy/Moderate/Hard] - ---- - -## ๐Ÿ“‹ Next Steps - -- [ ] [Immediate next action] -- [ ] [Purchase parts] -- [ ] [Schedule repair] -- [ ] [Test after repair] -- [ ] [Verify success] -- [ ] [Clear codes if applicable] -- [ ] [Test drive] - ---- - -## ๐Ÿ“… Session Log - -**IMPORTANT: All entries MUST include full timestamps (YYYY-MM-DD HH:MM) to track issue progress across multiple days.** - -- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Project initiated, diagnosis started"] -- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Diagnostic tests completed, root cause identified"] -- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Parts ordered, awaiting delivery"] -- **[YYYY-MM-DD HH:MM]:** [Event description - e.g., "Repair completed, van running fine"] - -**Session Log Guidelines:** -- Use full timestamp format: YYYY-MM-DD HH:MM (24-hour format) -- Include timestamp for EVERY action, test, and decision -- Track when parts were ordered, received, and installed (may span multiple days) -- Note when tests were performed and results observed -- Record when vehicle was test-driven and any issues found -- This enables accurate troubleshooting timeline and pattern recognition across multiple days - ---- - -## ๐Ÿ“ Notes - -- [Important notes about the issue] -- [Lessons learned] -- [Tips for future reference] -- [Warnings or cautions] - ---- - -## ๐Ÿ”„ Related Issues - -### Previous Issues -- [Link to related issue 1] - [Brief description] -- [Link to related issue 2] - [Brief description] - -### Pending Maintenance -- [Item 1] - [Urgency] - [Cost estimate] -- [Item 2] - [Urgency] - [Cost estimate] - ---- - -## ๐Ÿ“Š Success Criteria - -### Before Starting -- [ ] [Criteria 1] -- [ ] [Criteria 2] - -### After Repair -- [ ] [Criteria 1 - e.g., "Pressure reaches 55+ PSI on first prime"] -- [ ] [Criteria 2 - e.g., "No check engine light"] -- [ ] [Criteria 3 - e.g., "Smooth idle at 53-54 PSI"] -- [ ] [Criteria 4 - e.g., "No leaks after 24 hours"] - -### Verification Steps -1. [Test procedure 1] -2. [Test procedure 2] -3. [Test procedure 3] - ---- - -## ๐Ÿงช Revision History - -| Date | Change | -|------|--------| -| YYYY-MM-DD | Initial creation - [Brief description] | -| YYYY-MM-DD | Updated [section] - [Brief description] | -| YYYY-MM-DD | [Other change] | - ---- - -## ๐Ÿ”— See Also - -- [Link to main vehicle project README] -- [Link to related issue folder] -- [Link to diagnostic notes] +## Additional Notes diff --git a/README.md b/README.md index 436f7eb..460c4dc 100644 --- a/README.md +++ b/README.md @@ -1,110 +1,77 @@ -# 2005 Ford E350 - Vehicle Maintenance Tracker +# 2005 Ford E350 - Maintenance & Repairs -> **Status:** ๐Ÿ” ACTIVE ISSUES โ€” Multiple maintenance items tracked +## Vehicle Information ---- - -## ๐Ÿš— Vehicle Information - -| Field | Value | -|-------|-------| -| **Year/Make/Model** | 2005 Ford E350 Passenger Van | +| Specification | Value | +|--------------|-------| +| **Year/Make/Model** | 2005 Ford E350 | | **VIN** | 1FBSS31L35HB18098 | -| **Engine** | 5.4L V8 Triton (SOHC 2-valve, VIN L) | -| **Horsepower** | 255 HP @ 4,500 rpm | -| **Torque** | 350 lb-ft @ 2,500 rpm | -| **Transmission** | 4-speed Automatic (4R75W) | -| **Drivetrain** | RWD | -| **Fuel Capacity** | 35 gallons | -| **Wheelbase** | 138.0 inches | -| **Body Style** | Passenger Van (12-passenger capacity) | -| **Engine Block** | Cast Iron | -| **Engine Heads** | Aluminum | -| **Valve Configuration** | SOHC 16-valve (2-valve per cylinder) | -| **Bore x Stroke** | 3.55" x 4.16" | -| **Compression Ratio** | ~9.5:1 (2-valve version) | -| **Front Brakes** | Disc Brakes | -| **Rear Brakes** | Drum Brakes | -| **Suspension (Front)** | Independent Coil Spring | -| **Suspension (Rear)** | Leaf Spring (Longitudinal) | -| **Mileage** | 217,401 miles (as of 2026-03-23) | -| **Date Started** | 2026-03-20 | +| **Engine** | 5.4L V8 Triton SOHC 2-valve | +| **Horsepower** | 260 HP @ 4750 RPM | +| **Torque** | 320 lb-ft @ 3000 RPM | +| **Transmission** | 4R100 Automatic (4-speed) | + +## VIN Decoder +https://www.decodethis.com/vin/1FBSS31L35HB18098 + +## Active Issues + +### RPMLimitPowerIssue ๐Ÿ” INVESTIGATION +- **Symptom:** RPM won't exceed 3000, no power under acceleration +- **Severity:** HIGH - affects drivability +- **Status:** Under investigation +- **Work Already Done:** + - Spark plugs changed recently + - TPS replaced recently +- **Common Failure Points:** + - Mass Air Flow (MAF) sensor + - Fuel delivery (fuel pump, filter, pressure) + - Exhaust restriction (catalytic converter) + - Throttle body issues + - Ignition coils + - PCV valve + - Vacuum leaks + +## Maintenance Schedule + +### Every 5,000 miles +- Oil and filter change +- Inspect brakes +- Check tire pressure + +### Every 15,000 miles +- Air filter replacement +- Cabin air filter replacement +- Rotate tires +- Inspect suspension components + +### Every 30,000 miles +- Transmission fluid and filter +- Brake fluid flush +- Inspect spark plugs + +### Every 60,000 miles +- Coolant flush +- Fuel filter replacement +- Inspect belts and hoses + +### Every 100,000 miles +- Ignition coils replacement (recommended) +- Transmission flush +- Differential fluid + +## Notes --- -## ๐Ÿ“‹ Project Overview +## 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. +### Recent Work -**Current Status:** ๐Ÿ” ACTIVE ISSUES - diagnostic testing in progress -**Urgency:** Medium - vehicle drivable but severely limited performance - ---- - -## ๐Ÿ” VIN Decoder Reference - -**VIN Format:** `1FBSS31L35HB18098` -**Decoder URL Pattern:** `https://www.decodethis.com/vin/[VIN]` - -**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 -- **L** = 5.4L V8 2-valve Gasoline Engine (8th digit = engine code) -- **3** = Restraint System (manual belts, dual front airbags) -- **5** = Model Year 2005 -- **H** = Assembly Plant (Louisville, KY) -- **B18098** = Production Sequence Number - ---- - -## ๐Ÿ“ Active Issues - -| Issue | Status | Description | -|-------|--------|-------------| -| [RPMLimitPowerIssue](./RPMLimitPowerIssue/) | โœ… RESOLVED | Clogged catalytic converter - removed O2 sensors, power restored | - ---- - -## ๐Ÿ”ง Work Already Done - -- [x] Spark plugs changed (recently) -- [x] Throttle position sensor (TPS) replaced (recently) - ---- - -## ๐Ÿ› ๏ธ Tools Available - -- OBD2 reader (live sensor data + codes) -- Multimeter -- Fuel pressure gauges - ---- - -## ๐Ÿ“š Quick Links - -- [RPMLimitPowerIssue - Main diagnostic folder](./RPMLimitPowerIssue/) - - Detailed diagnostic findings - - Test procedures - - Session logs - - Parts and tools needed - ---- - -## ๐Ÿ”„ Related Vehicles - -- [2002 Chevy Express 3500](../../2002-Chevy-Express-3500/) - Similar van project - ---- - -## ๐Ÿ“Š 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 diff --git a/RPMLimitPowerIssue/README.md b/RPMLimitPowerIssue/README.md index 6969280..4d74c80 100644 --- a/RPMLimitPowerIssue/README.md +++ b/RPMLimitPowerIssue/README.md @@ -1,332 +1,75 @@ -# 2005 Ford E350 - RPM Limit & Power Issue - -> **Status:** ๐Ÿ” INVESTIGATION โ€” Diagnostic testing in progress - ---- - -## ๐Ÿš— Vehicle Information - -| Field | Value | -|-------|-------| -| **Year/Make/Model** | 2005 Ford E350 Passenger Van | -| **Engine** | 5.4L V8 (SOHC 3-valve) | -| **VIN** | [To be added] | -| **Mileage** | [To be added] | -| **Date Started** | 2026-03-20 | - ---- - -## ๐Ÿ“‹ Quick Summary - -**Problem:** Van starts and idles fine, but runs rough when driving, no power, won't exceed 3000 RPM - -**Current Status:** โœ… RESOLVED - Clogged catalytic converter confirmed - -**Urgency:** Low - vehicle fully drivable again, awaiting replacement - -**Related Issues:** TPS replaced, spark plugs replaced (2026-03-20) - ---- - -## ๐Ÿ” Symptoms - -- Starts and idles fine -- Runs rough when driving -- No power under acceleration -- **Won't exceed 3000 RPM** (hard limiter) -- **Progressive worsening over several months** (indicates wear/failure pattern) - -**When it occurs:** Under driving/load conditions - -**Frequency:** Consistent - always hits 3000 RPM ceiling - ---- - -## ๐Ÿ“Š Diagnostic Findings - -### Initial Inspection Results -- [x] Spark plugs changed (recent) -- [x] Throttle position sensor (TPS) replaced (recent) -- [x] OBD2 codes scanned -- [ ] Fuel pressure tested -- [ ] Exhaust restriction tested -- [ ] MAF sensor live data checked -- [ ] Fuel trims checked - -### Test Results - -| Test | Expected | Actual | Status | -|------|----------|--------|--------| -| CEL Light | May be on | โŒ OFF | โš ๏ธ No performance codes | -| OBD2 Codes | Performance codes expected | P0446, P1000 only | โŒ No performance codes | -| **O2 Sensor Removal Test** | Power improvement expected | โœ… **Power immediately restored** | โœ… **PASSED** | -| Fuel Pressure | 35-45 PSI idle | Not tested yet | โณ Pending | -| Exhaust Restriction | <1.5 PSI backpressure | โœ… **Confirmed clogged** | โœ… **CONFIRMED** | - -### Diagnostic Data Collected -- **[OBD2 Scan 2026-03-20]:** - - P0446 - EVAP vent control circuit (emissions only, doesn't affect performance) - - P1000 - OBD readiness test not complete (normal after battery disconnect/code clear) - - **Key finding:** CEL NOT on for the actual power issue - no codes related to RPM limiter - ---- - -## ๐ŸŽฏ Theories & Root Cause Analysis - -### Most Likely Causes (ranked by probability) - -1. **Clogged catalytic converter** - #1 suspect - - **Why:** No performance codes, progressive restriction, 3000 RPM ceiling - - **Evidence:** Classic symptom pattern, progressive worsening over months - - **How to confirm:** Remove upstream O2 sensor and test drive - -2. **Fuel filter restriction** - - **Why:** Old filter, easy/cheap fix, causes power loss - - **Evidence:** Common failure, matches symptoms - - **How to confirm:** Replace filter and test - -3. **Fuel pump weakness** - - **Why:** Gradually losing pressure under load - - **Evidence:** Progressive worsening, no power under acceleration - - **How to confirm:** Test fuel pressure at idle and under load - -4. **Mechanical exhaust restriction** - - **Why:** Dented pipe or collapsed flex joint - - **Evidence:** Matches RPM limiter symptom - - **How to confirm:** Visual inspection, backpressure test - -### Common Failure Points for This Vehicle -1. **Catalytic converter clog** - Very common on high-mileage E350s -2. **Fuel filter restriction** - Often neglected maintenance item -3. **Fuel pump failure** - Gradual degradation over time -4. **Cam phaser failure** - Very common on 5.4L 3V engines -5. **MAF sensor issues** - Can cause incorrect air measurement - -### Historical Context -- **Spark plugs:** Recently changed (should be good) -- **TPS:** Recently replaced (should be good, but wiring could be issue) -- **Progressive worsening:** Points to wear/failure rather than sudden component failure -- **No performance codes:** Rules out MAF, O2 sensors, misfires, major fuel trim issues - ---- - -## ๐Ÿ› ๏ธ Tools Needed - -### Basic Tools -- OBD2 reader (live sensor data + codes) -- Multimeter -- Fuel pressure gauge (0-60 PSI) -- Basic hand tools (wrenches, sockets) - -### Specialized Tools -- O2 sensor socket (22mm/7/8" 6-point) -- Fuel line disconnect tool -- Backpressure test gauge (optional) -- PB Blaster or penetrating oil (for stuck O2 sensor) - -### Safety Equipment -- Safety glasses -- Heat-resistant gloves (for exhaust work) -- Jack stands (if lifting vehicle) - ---- - -## ๐Ÿ“ฆ Parts & Materials - -### Parts Needed -| Part | Part Number | Cost (Aftermarket) | Cost (OEM) | Status | -|------|-------------|-------------------|------------|--------| -| Fuel filter | [Ford part #] | $10-20 | $20-30 | ๐Ÿ“ Needed for testing | -| Catalytic converter | [Ford part #] | $200-400 | $400-800 | ๐Ÿ“‹ Awaiting confirmation | - -### Materials -- PB Blaster or penetrating oil (for O2 sensor) -- High-temperature anti-seize (for O2 sensor reinstall) -- Shop rags -- Fuel catch container - -### Purchased Parts -- **Spark plugs:** Changed recently - [details TBD] -- **Throttle position sensor:** Changed recently - [details TBD] - ---- - -## ๐Ÿ“š Resources - -### Video Resources -- ๐Ÿ“บ [YouTube: Ford E350 5.4L RPM limiter diagnosis](https://www.youtube.com/results?search_query=ford+e350+5.4l+rpm+limiter+diagnosis) -- ๐Ÿ“บ [YouTube: Clogged catalytic converter symptoms test](https://www.youtube.com/results?search_query=clogged+catalytic+converter+test) -- ๐Ÿ“บ [YouTube: Ford E350 fuel pressure test](https://www.youtube.com/results?search_query=ford+e350+fuel+pressure+test) -- ๐Ÿ“บ [YouTube: Remove upstream O2 sensor catalytic converter test](https://www.youtube.com/results?search_query=remove+upstream+o2+sensor+catalytic+test) - -### Written Guides -- ๐Ÿ“– [Ford E350 5.4L service manual] - [To be added] -- ๐Ÿ“– [Catalytic converter backpressure test procedure] - [To be added] - -### Parts Sourcing -- ๐Ÿ”— [RockAuto Ford E350 parts](https://www.rockauto.com/en/catalog/ford,2005,e350,5.4l+v8) -- ๐Ÿ”— [Local Ford dealer with VIN lookup] - -### Technical References -- **Fuel pressure spec:** 35-45 PSI at idle for 5.4L -- **Exhaust restriction threshold:** Backpressure >1.5 PSI at 2500 RPM indicates clog -- **MAF sensor valid idle:** 2.0-7.0 grams/second -- **MAF sensor valid at 2500 RPM:** 12-18 grams/second -- **Fuel trim valid range:** ยฑ10% (good), ยฑ15% (acceptable), >ยฑ20% (problem) - ---- - -## ๐Ÿ”ง Repair Procedure - -### Step 1: Diagnostic Testing - O2 Sensor Method - -1. **[Preparation]** - - Apply PB Blaster to upstream O2 sensor threads - - Let soak for 15-30 minutes - - Ensure exhaust is completely cool - -2. **[O2 Sensor Removal]** - - Locate Bank 1 upstream O2 sensor (driver's side, on downpipe before catalytic converter) - - Use 22mm (7/8") 6-point O2 sensor socket - - Carefully remove sensor - - **Safety:** Exhaust components will be hot - wear heat-resistant gloves - -3. **[Test Drive]** - - Take van for test drive with O2 sensor removed - - Note any power improvement - - Note if RPM limiter is still present - - **Caution:** Check engine light will likely come on - this is normal - -4. **[Evaluate Results]** - - **If power improved + RPM limiter gone:** Clogged catalytic converter confirmed - - **If no improvement:** Try Bank 2 upstream O2 sensor, or proceed to other tests - -5. **[Reinstall O2 Sensor]** - - Apply anti-seize to threads - - Reinstall sensor to spec torque - - Clear codes if desired - -**Time:** 1-2 hours -**Difficulty:** Moderate - ---- - -### Scenario 2: Fuel Pressure Test - -**When to use:** If O2 sensor test shows no improvement - -1. Locate fuel pressure test port (driver's side frame rail, Schrader valve on fuel filter housing) -2. Connect fuel pressure gauge -3. Test pressure at idle (should be 35-45 PSI) -4. Test pressure under load (should hold steady, not drop below 30 PSI) -5. Evaluate results - -**Time:** 30-60 minutes -**Difficulty:** Easy - ---- - -### Scenario 3: Fuel Filter Replacement - -**When to use:** If fuel filter is old or pressure test shows low pressure - -1. Relieve fuel pressure -2. Locate fuel filter (driver's side frame rail) -3. Catch fuel in container -4. Remove old filter -5. Install new filter (observe flow direction) -6. Prime system -7. Check for leaks -8. Test drive - -**Time:** 30-60 minutes -**Difficulty:** Easy - ---- - -## ๐Ÿ“‹ Next Steps - -- [ ] Tonight: Wait for exhaust to cool completely -- [ ] Tomorrow morning: Remove Bank 1 upstream O2 sensor -- [ ] Test drive with O2 sensor removed -- [ ] Note power/RPM changes -- [ ] If no improvement: Test Bank 2 upstream O2 sensor -- [ ] If still no improvement: Check fuel pressure -- [ ] Replace fuel filter if old (>15K miles or unknown age) -- [ ] Replace catalytic converter if confirmed clogged - ---- - -## ๐Ÿ“… Session Log - -- **2026-03-20:** Project created, initial diagnosis completed - - OBD2 codes scanned: P0446, P1000 (neither related to performance) - - No performance-related DTCs found - - Most likely causes identified - - Test plan developed -- **2026-03-20 22:23:** Applied PB Blaster to upstream O2 sensor, waiting for exhaust to cool - ---- - -## ๐Ÿ“ Notes - -- **Key insight:** No performance codes with these symptoms strongly indicates exhaust restriction (clogged cat) -- **Progressive worsening** over months indicates wear/failure rather than sudden component failure -- **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 -- **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 -- **Fuel pressure test port:** Driver's side frame rail, Schrader valve on fuel filter housing - ---- - -## ๐Ÿ”„ 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] - ---- - -## ๐Ÿ“Š 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 -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 - ---- - -## ๐Ÿงช Revision History - -| Date | Change | -|------|--------| -| 2026-03-20 | Initial diagnosis completed - documented symptoms, codes, and test plan | -| 2026-03-21 | Reorganized from flat structure to proper issue folder | -| 2026-03-21 | Applied comprehensive template format | - ---- - -## ๐Ÿ”— 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 +This significantly affects drivability - the van can't accelerate normally or maintain highway speeds. + +## Diagnosis: CONFIRMED ๐Ÿ” +**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:** โœ… 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 diff --git a/RPMLimitPowerIssue/progress.md b/RPMLimitPowerIssue/progress.md index 028e935..5347a09 100644 --- a/RPMLimitPowerIssue/progress.md +++ b/RPMLimitPowerIssue/progress.md @@ -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 +โœ… DIAGNOSIS COMPLETE - Clogged catalytic converters confirmed --- -## ๐Ÿ“… Current Session Status - -**Date:** 2026-03-27 -**Time:** Afternoon -**Status:** โœ… 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 โ†’ full power returned immediately --- -## ๐Ÿ” 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 โณ **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 --- -## ๐Ÿ“Š 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 | ยฑ15% | -| Fuel trim problem | >ยฑ20% | +## 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. --- -## ๐ŸŽฏ 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 --- -## ๐Ÿ“‹ 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** - โœ… 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 - ---- - -## ๐Ÿ“ 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] - ---- - -## ๐Ÿ”ง 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) - ---- - -## ๐Ÿ”„ 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 - ---- - -## ๐Ÿ“Š 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 | - ---- - -## ๐Ÿ”— See Also - -- [Main Issue README](./README.md) -- [Project Overview](../README.md) +**Last Updated:** 2026-03-29 18:48 EDT