1991 GMC Sonoma Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1991 GMC Sonoma

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1991 GMC Sonoma Problems

Oil-soaked spark plug wire rubber boots can cause misfire or rough idle

The spark plug wire rubber boots may get soaked with oil, causing a misfire or rough idle.

ABS Light Due to Brake System Control Unit Failure

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.

Oil Leak From Distributor Shaft Seal

An engine oil leak may develop from the distributor shaft o-ring seal.

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1991 GMC Sonoma Questions

My 1991 gmc sonoma 4.3 liter is loosing too much water (1 answer)

and I don't know why i just had my heads and my throttle body redone it was blowing clouds of white smoke every time I turned it on or let it sit while running now it does it only when it's cold or low on water.... need some ones opinion !

My ignition is stuck in the locked position. Is it an easy fix? (1 answer)

I just bought the truck. I started it just about 2 weeks before I bought it, it ran fine. I go to start it after I bought it and the ignition is stuck in the locked position. I can't move any of the pieces. Not even the unlock switch.

Driver side door "drops" when opened. (1 answer)

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1991 GMC Sonoma Recalls

Recall 99V193000
VEHICLE DESCRIPTION: CERTAIN 4-WHEEL DRIVE PICKUP TRUCKS AND SPORT UTILITY VEHICLES EQUIPPED WITH ABS (ANTILOCK BRAKING SYSTEM) MANUFACTURED FROM SEPTEMBER 1989 THROUGH AUGUST 1996. UNDER CERTAIN DRIVING CONDITIONS THE SWITCH WHICH SIGNALS THE ABS SYSTEM WHETHER THE VEHICLE IS IN 2-WHEEL OR 4-...

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1991 GMC Sonoma Reviews

Good truck have broken it in with 453,000 on it . All original motor 4.3 just keeps going and going. Passes emish with flying colors. Just keep them cool and tuned and run super in it will last for ever.
This truck is dependable for work use for me. I replaced the engine in this and at the same time replaced the transmission with the correct one. The image here is not the same type as mine as mine is a swb with a regular cab. Has a 5 speed transmission with a 2.5L engine in it.

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