1986 Pontiac Bonneville Service and Repair Manual

This factory service and repair manual for the 1986 Pontiac Bonneville covers a 4-door sedan whose engine list has three entries: a 3.8L V6, a 4.3L V6 and a 5.0L V8. The trio share overhead valves, natural aspiration and gasoline. Trim choices are Base, Brougham and LE. The manual provides procedures, specifications and torque values for the engine, fuel and ignition systems, cooling, transmission, brakes, suspension, steering and electrical system.

Engines covered

• 3.8L V6 (231 cu in) — OHV, naturally aspirated, gasoline
• 4.3L V6 (262 cu in) — OHV, naturally aspirated, gasoline
• 5.0L V8 (305 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base
• Brougham
• LE

Known issues on the 1986 Bonneville. The federal record contains 1 recall for the 1986 Bonneville. The push-pull headlight switch on certain 1986 Bonneville vehicles could have contacts that break the circuit intermittently, so the headlamps might flicker or go out without warning, reducing visibility at night or in poor weather. The switch was replaced where needed. Owners logged 3 complaints, split between exterior lighting, the power train and structure. Lighting wiring diagrams and electrical diagnostics are included, as are procedures for the power train and body.