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Updated with confirmed trouble codes P0300 + P0455 and mileage 165,722 miles

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John Loper II
2026-03-22 13:25:13 -04:00
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README.md
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| **Front Suspension** | MacPherson Strut with Double Tube dampers |
| **Rear Suspension** | Multi-Link Coil Springs with Double Tube dampers |
| **Headlight Bulb** | 9007 Halogen |
| **Mileage** | 165,722 miles |
| **Date Started** | 2026-03-21 |
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@@ -63,7 +64,8 @@ Each folder below represents a specific maintenance issue or repair:
| Date | Change |
|------|--------|
| 2026-03-22 | Added TuneUp issue - random/multiple cylinder misfire |
| 2026-03-22 13:22 | Added mileage 165,722 miles |
| 2026-03-22 12:19 | Added TuneUp issue - random/multiple cylinder misfire |
| 2026-03-21 | Project created |
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TuneUp/README.md
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# Project: 2003 Chevrolet Express 3500 - Tune-Up (Random/Multiple Cylinder Misfire)
> **Status:** 🔍 INVESTIGATION — Sporadic check engine light flashing, underlying code indicates random/multiple cylinder misfire condition
> **Status:** 🔍 INVESTIGATION — P0300 (random/multiple cylinder misfire) + P0455 (large EVAP leak) confirmed
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**Problem:** Sporadic check engine light flashing due to random/multiple cylinder misfire condition
**Confirmed Trouble Codes (2026-03-22):**
- **P0300** - Random/Multiple Cylinder Misfire Detected
- **P0455** - Evaporative Emission (EVAP) System - Large Leak Detected
**Vehicle Mileage:** 165,722 miles
**Current Status:**
- Check engine light flashing sporadically
- Underlying code(s) indicate random/multiple cylinder misfire
- Random/multiple cylinder misfire confirmed (P0300)
- Large EVAP leak also present (P0455)
- Needs tune-up (spark plugs, wires, or distributor cap/rotor)
- Vehicle drivable but needs maintenance
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## 📊 Diagnostic Findings
### Initial Inspection Results
- [ ] Get specific diagnostic trouble codes (DTCs) from vehicle
- [ ] Check misfire code details (which cylinders affected, frequency)
- [x] Get specific diagnostic trouble codes (DTCs) from vehicle ✅ **CONFIRMED**
- [x] Check misfire code details (which cylinders affected, frequency) ✅ **P0300** - random/multiple
- [ ] Verify if code is pending or confirmed
- [ ] Check freeze frame data for operating conditions when misfire occurs
- [ ] Inspect spark plugs (wear, gap, condition)
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| Test | Expected | Actual | Status | Tested At (YYYY-MM-DD HH:MM) |
|------|----------|--------|--------|------------------------------|
| Check Engine Light | Steady or flashing | Flashing sporadically | ⚠️ Issue | TBD |
| Misfire Codes | P0300 (random) + P0301-P0308 (cylinder-specific) | TBD | ⏳ Pending | TBD |
| Misfire Codes | P0300 (random) + P0301-P0308 (cylinder-specific) | **P0300 (confirmed)** | ⚠️ Issue | 2026-03-22 13:22 |
| EVAP Codes | - | **P0455 (large leak confirmed)** | ⚠️ Issue | 2026-03-22 13:22 |
| Vehicle Mileage | TBD | **165,722 miles** | 📝 Documented | 2026-03-22 13:22 |
| Freeze Frame Data | RPM, load, temp when misfire occurred | TBD | ⏳ Pending | TBD |
| Spark Plugs | Clean, proper gap, no carbon buildup | TBD | ⏳ Pending | TBD |
| Spark Plug Wires | Low resistance, no cracks | TBD | ⏳ Pending | TBD |
| Distributor Cap/Rotor | No carbon tracking, clean contacts | TBD | ⏳ Pending | TBD |
### Diagnostic Data Collected
- **Misfire codes:** TBD (John will provide specific codes)
- **Affected cylinders:** TBD (specific cylinder numbers)
- **Misfire codes:** **P0300** - Random/Multiple Cylinder Misfire Detected
- **EVAP codes:** **P0455** - Evaporative Emission (EVAP) System - Large Leak Detected
- **Affected cylinders:** Multiple/random (not cylinder-specific)
- **Misfire frequency:** TBD (counts per 1000 revs)
- **Vehicle mileage:** 165,722 miles
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- **[2026-03-22 12:19]:** Issue initiated - John reports sporadic check engine light flashing with random/multiple cylinder misfire condition
- **[2026-03-22 12:19]:** Need specific diagnostic codes from John to proceed with detailed diagnostics
- **[2026-03-22 TBD]:** Next: John to provide DTCs so we can determine which cylinders are affected and plan parts replacement
- **[2026-03-22 13:22]:** **TROUBLE CODES CONFIRMED** - P0300 (random/multiple cylinder misfire) + P0455 (large EVAP leak); Vehicle mileage: 165,722 miles
- **[2026-03-22 TBD]:** Next: Inspect spark plugs, wires, and distributor cap/rotor to determine root cause of P0300; Check EVAP system for large leak (gas cap, purge valve, vents, lines, or tank)
**Session Log Guidelines:**
- Use full timestamp format: YYYY-MM-DD HH:MM (24-hour format)
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| Date | Change |
|------|--------|
| 2026-03-22 13:22 | Confirmed trouble codes P0300 + P0455; Documented mileage 165,722 miles |
| 2026-03-22 12:19 | Initial creation - Tune-up issue for random/multiple cylinder misfire |
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