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 ProblemsReplace Fuel Filter Every 30,000 to Prevent Fuel Pump Failure
The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require replacement.
The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.
1991 GMC Sonoma QuestionsMy 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 !
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.