Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2004ENVOY 2WD L6-4.2L VIN SREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER BLOCK ASSEMBLYSPECIFICATIONSENGINE MECHANICAL SPECIFICATIONS-UNIT REPAIR
2004 GMC Envoy 2WD L6-4.2L VIN S
Engine Mechanical Specifications-Unit Repair
2004 GMC Envoy 2WD L6-4.2L VIN SSECTION Engine Mechanical Specifications-Unit Repair
| General Data | Engine Type | In-Line-6 |
| Displacement | 4.2 L | |
| RPO (VIN Code) | LL8 | |
| Bore | 3.66 inch | |
| Stroke | 4.02 inch | |
| Compression Ratio | 10:1 | |
| Firing Order | 1-5-3-6-2-4 | |
| Oil Pressure (At the sending unit) Warm - Minimum | 112 psi @ 1200 RPM | |
| Spark Plug Gap | Maximum | 0.050 inch |
| Minimum | 0.044 inch |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.