1991 Buick Riviera Service and Repair Manual

This factory service and repair manual for the 1991 Buick Riviera works from a gasoline 3.8L V6, overhead-valve and naturally aspirated, installed in the two-door coupe. Luxury is the lone trim. Specifications and torque values for that engine come alongside procedures for the cooling, fuel and ignition systems. Beyond the engine bay, diagnostics and procedures reach the transaxle, the hydraulic brakes and parking brake, the suspension and the steering, while wiring diagrams follow the electrical system through the body.

Engines covered

• 3.8L V6 (231 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 2-door coupe

Trims covered

• Luxury

Known issues on the 1991 Riviera. Seat belts run through this year's record. The 1 recall affected certain 1991 Riviera vehicles whose front outboard shoulder belt could jam where the stitched stop on the webbing caught in the retractor, making the belt hard to draw out and, for some occupants, impossible to buckle; on request, dealers fitted a stop button to the webbing. Of 8 owner complaints, 3 involve the hydraulic brakes and 2 the seat belts, with 1 complaint reporting a crash and 1 reporting an injury. The manual pairs brake procedures and torque values with body diagnostics for those areas.