1988 GMC R1500 Suburban Service and Repair Manual
This factory service and repair manual for the 1988 GMC R1500 Suburban lists two engines — a naturally aspirated 6.2L diesel V8 of 379 cubic inches and a 5.7L gasoline V8 of 350 cubic inches — in a four-door sport utility offered as a Base or a Sierra Classic. Those two engines share a chassis but almost nothing else in service terms, and the manual reflects that, keeping their procedures and specifications apart while treating the transmission, axles, brakes, suspension and body electrical system as common ground with torque values, wiring diagrams and diagnostics throughout.
Engines covered
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 4-door sport utility
Trims covered
- Base
- Sierra Classic
Known issues on the 1988 R1500 Suburban. The federal record for this model year is clean: no recalls, and no owner complaints logged with NHTSA. Practically, the manual earns its keep on the diesel — injection pump timing, glow plug circuit diagnosis and cooling system specifications for the 6.2L — and on the running gear that a heavy four-door body works hard, meaning front suspension, steering, brakes and rear axle. Procedures, specifications, torque values, wiring diagrams and diagnostics are given for all of it.
