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Initial commit: 2003 Chevy Express 3500 Vehicle Maintenance Tracker

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- README.md with vehicle info, VIN decoder, and recommended maintenance
- ISSUE_TEMPLATE.md for tracking maintenance issues
- Project ready for John to add mileage and start documenting issues
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John Loper II
2026-03-21 21:31:10 -04:00
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ISSUE_TEMPLATE.md
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# Vehicle Issue Template
**Use this template for new vehicle issues. Copy to a new subfolder within your vehicle's main project folder.**
---
## 🚗 Vehicle Information
| 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] |
---
## 📋 Quick Summary
**Problem:** [Brief description of the issue]
**Current Status:** [e.g., 🔍 INVESTIGATION / 🔧 PARTS NEEDED / ✅ RESOLVED]
**Urgency:** [High/Medium/Low - e.g., "High - vehicle not drivable" or "Low - can wait"]
**Related Issues:** [Any connections to other issues, codes, or symptoms]
---
## 🔍 Symptoms
- [Symptom 1]
- [Symptom 2]
- [Symptom 3]
- [Symptom 4]
**When it occurs:** [e.g., "Cold start only," "At idle," "Under load," "Random"]
**Frequency:** [Always / Sometimes / Rarely]
---
## 📊 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] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
| [Test 2] | [Expected value] | [Actual reading] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
| [Test 3] | [Expected value] | [Actual reading] | ✅/❌/⚠️ | [YYYY-MM-DD HH:MM] |
### Diagnostic Data Collected
- **[Test 1]:** [Results and conclusions]
- **[Test 2]:** [Results and conclusions]
- **[Test 3]:** [Results and conclusions]
---
## 🎯 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]
---
## 🛠️ Tools Needed
### Basic Tools
- [Tool 1]
- [Tool 2]
- [Tool 3]
### Specialized Tools
- [Tool 1]
- [Tool 2]
### Safety Equipment
- [Safety glasses]
- [Gloves]
- [Jack stands]
---
## 📦 Parts & Materials
### Parts Needed
| Part | Part Number | Cost (Aftermarket) | Cost (OEM) | Status |
|------|-------------|-------------------|------------|--------|
| [Part 1] | [e.g., 88915445] | $[00-00] | $[00-00] | 📝 Needed / 📋 Awaiting / ✅ Ordered |
| [Part 2] | [e.g., -] | $[00-00] | $[00-00] | 📝 Needed / 📋 Awaiting / ✅ Ordered |
### Materials
- [Fluid type and quantity]
- [Sealant type]
- [Cleaning supplies]
### Purchased Parts
- **[Part Name]:** [Where purchased], [Cost], [Date]
- **[Part Name]:** [Where purchased], [Cost], [Date]
---
## 📚 Resources
### Video Resources
- 📺 [YouTube: [Topic]](https://www.youtube.com/results?search_query=[search_terms]) - [Description]
- 📺 [YouTube: [Specific Guide]](https://www.youtube.com/watch?v=[video_id]) - [Description]
### Written Guides
- 📖 [Written guide title](https://example.com) - [Description]
- 📖 [Service manual section] - [Description]
### Parts Sourcing
- 🔗 [RockAuto link]
- 🔗 [eBay search link]
- 🔗 [Local parts store with VIN lookup]
### Technical References
- [Service manual reference]
- [Technical service bulletins]
- [Forums or community resources]
---
## 🔧 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]
---
## 📋 Next Steps
- [ ] [Immediate next action]
- [ ] [Purchase parts]
- [ ] [Schedule repair]
- [ ] [Test after repair]
- [ ] [Verify success]
- [ ] [Clear codes if applicable]
- [ ] [Test drive]
---
## 📅 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
---
## 📝 Notes
- [Important notes about the issue]
- [Lessons learned]
- [Tips for future reference]
- [Warnings or cautions]
---
## 🔄 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]
---
## 📊 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]
---
## 🧪 Revision History
| Date | Change |
|------|--------|
| YYYY-MM-DD | Initial creation - [Brief description] |
| YYYY-MM-DD | Updated [section] - [Brief description] |
| YYYY-MM-DD | [Other change] |
---
## 🔗 See Also
- [Link to main vehicle project README]
- [Link to related issue folder]
- [Link to diagnostic notes]
README.md
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# 2003 Chevrolet Express 3500 - Vehicle Maintenance Tracker
---
## 🚗 Vehicle Information
| Field | Value |
|-------|-------|
| **Year/Make/Model** | 2003 Chevrolet Express 3500 |
| **VIN** | 1GAHG39U531215709 |
| **Engine** | 6.0L V8 (LQ4 Vortec) |
| **Horsepower** | 300 HP @ 5,200 rpm |
| **Torque** | 360 lb-ft @ 4,000 rpm |
| **Transmission** | 4-speed Automatic (4L80-E heavy-duty) |
| **Drivetrain** | RWD |
| **Fuel Capacity** | 31 gallons |
| **Curb Weight** | ~5,000-5,500 lbs |
| **Max Towing Capacity** | ~10,000 lbs (varies by configuration) |
| **Wheelbase** | 135.0 inches (standard) / 155 inches (extended) |
| **Overall Length** | 218.8 inches (standard) / 238.8 inches (extended) |
| **Overall Width** | 79.4 inches |
| **Overall Height** | 82.5-82.8 inches |
| **Tire Size** | P245/75R16 |
| **Rim Size** | 16" steel |
| **Valve Configuration** | OHV (16-valve) |
| **Compression Ratio** | 9.6:1 |
| **Engine Oil Capacity** | 6 quarts (6.0L with filter) |
| **Brakes (Front)** | Dual Hydraulic Disc |
| **Brakes (Rear)** | Dual Drum Brakes |
| **Front Suspension** | MacPherson Strut with Double Tube dampers |
| **Rear Suspension** | Multi-Link Coil Springs with Double Tube dampers |
| **Headlight Bulb** | 9007 Halogen |
| **Date Started** | 2026-03-21 |
---
## 📋 Project Overview
This repository tracks all maintenance, repairs, and issues for the 2003 Chevrolet Express 3500. Each subfolder represents a specific issue or maintenance task with its own progress tracking.
**Current Status:** 🆕 NEW PROJECT - Awaiting vehicle details
**Urgency:** TBD
---
## 📁 Issue Folders
Each folder below represents a specific maintenance issue or repair:
- **[Issue Name](./[issue-folder]/)** - Status - Brief description
---
## 🔄 Related Vehicles
- [2002 Chevy Express 3500](../../2002-Chevy-Express-3500/) - Similar van project
- [2002 Chevy Express 1500](../../2002-Chevy-Express-1500/) - Smaller Express project
- [2005 Ford E350](../../2005-Ford-E350/) - Ford van project
---
## 📊 Revision History
| Date | Change |
|------|--------|
| 2026-03-21 | Project created |
---
## 🔍 VIN Decoder Reference
**VIN Format:** `1GAHG39U531215709`
**Decoder URL Pattern:** `https://www.decodethis.com/vin/[VIN]`
**VIN Breakdown:**
- **1** = United States (Manufacturer)
- **G** = General Motors
- **A** = Chevy
- **H** = GVWR Range 9001-10000 lbs
- **G3** = Express 3500 (1-ton)
- **9** = Brake System - Hydraulic
- **U** = 6.0L V8 Gasoline Engine (8th digit = engine code)
- **5** = Check Digit
- **3** = Model Year 2003
- **1** = Assembly Plant
- **215709** = Production Sequence Number
**Vehicle Specifics:**
- **1GA:** GM Chevrolet
- **HG:** Express 3500 cutaway van (1-ton, ~9000-10000 lbs GVWR)
- **39U:** 6.0L V8 LQ4 Vortec engine
- **3:** 2003 model year
---
## 🛠️ Recommended Maintenance
**Engine Oil:** 5W-30, 6 quarts with filter (LQ4 6.0L V8)
**Transmission Fluid:** DEXRON-III ATF, ~14 quarts (4L80-E)
**Spark Plugs:** 8x (LQ4 6.0L V8) - verify exact type with VIN lookup
**Coolant:** DEX-COOL (GM OAT formula) - ~16 liters capacity
**Power Steering Fluid:** DEXRON-III ATF (if equipped)
**Brake Fluid:** DOT 3, ~1 liter
**Maintenance Intervals:**
- Oil change: Every 7,500 miles or 6 months (severe) / 10,000 miles or 12 months (normal)
- Air filter: Every 30,000 miles
- Fuel filter: Every 30,000 miles
- Spark plugs: Every 100,000 miles (LQ4 uses long-life plugs)
- Transmission fluid: Every 50,000 miles (severe) / 100,000 miles (normal)
- Brake fluid: Every 45,000 miles
- Coolant: Every 100,000 miles (DEX-COOL extended drain)
- Power steering fluid: Every 60,000 miles
---
## 🔧 Common 2003 Express 3500 Issues
### Known Problem Areas
1. **Crankshaft position sensor** - Common failure point, causes no-start conditions
2. **Distributor cap/rotor** - Carbon tracking, moisture issues (if equipped)
3. **Fuel pump** - Weak pump can cause low fuel pressure
4. **Throttle body** - Carbon buildup, idle issues
5. **ABS module** - Common failure on high-mileage GM trucks
6. **Power steering rack seals** - External leaks
7. **Heater core** - Clogging, leaks
### LQ4 6.0L V8 Specific
- Generally very reliable engine
- LQ4 block is stronger than L31 5.7L
- OHV 16-valve design, similar to LS engine family
- Compatible with many LS engine parts
---