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 MANUALSGMC1991PICKUP C2500, 2D PICKUP, 6.2 J, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEAPPLICATIONENGINE/VIN IDENGINE CODE LOCATION
1991 GMC Pickup C2500, 2D Pickup, 6.2 J, Standard
Engine Code Location
1991 GMC Pickup C2500, 2D Pickup, 6.2 J, StandardSECTION Engine Code Location
The locations of the stamped codes for each particular engine are listed below. Refer to 1990-91 MODEL COVERAGE & IDENTIFICATION .
ENGINE CODE LOCATION
| Engine Code | Location(s) | ||
|---|---|---|---|
| LU2, LB4, LO3, LO5 & L19 | On front of engine block, on right side above timing gear cover OR on left side of engine block, on engine-to-transmission mating flange. | ||
| LN8 & L38 | On left side of engine block, at rear below cylinder head OR on left side of engine block, on engine-to-transmission mating flange. | ||
| LL2 | On front of engine block, on left side above timing gear cover OR on right side of engine block above engine mount. | ||
| LH6 & LL4 | On front of engine block, right side of timing gear housing casting OR on top of engine block, near left cylinder head-to-engine block mating surface, at front OR on left side of engine block, on engine-to-transmission mating flange. | ||
| LG6 | On left side of engine block, on engine-to-transmission mating flange. | ||
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RENDER: 1.0x
NO RELATED
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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.