1990 GMC R1500 Suburban Service and Repair Manual
This factory service and repair manual for the 1990 GMC R1500 Suburban covers the four-door sport utility in Base and SLE trim, with a choice of two overhead-valve V8s: the 5.7L gasoline engine of 350 cubic inches or the naturally aspirated 6.2L diesel of 379 cubic inches. The book is arranged by system rather than by variant, so engine, driveline, chassis and body electrical work each carry their own procedures, specifications, torque values, wiring diagrams and diagnostics, whichever of the two engines and trims is on the lift.
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
- SLE
Known issues on the 1990 R1500 Suburban. No recalls are on the federal record for the 1990 R1500 Suburban and no owner complaints have been logged with NHTSA. The manual therefore stands as the reference for ordinary service on a vehicle that is now decades old: injection and glow system work on the 6.2L diesel, fuel and ignition diagnosis on the 5.7L, transmission and rear axle procedures, brake and suspension specifications, and the wiring diagrams and diagnostics that make an intermittent electrical fault findable instead of a guessing game.
