1991 Pontiac Grand Prix Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Pontiac Grand Prix
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1991 Pontiac Grand Prix ProblemsEngine Control Module (ECM) can fail
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
1991 Pontiac Grand Prix QuestionsWhy vehicle starts on a cold start then rough after 5 to 12 min and Stahls (3 answers)
I replaced the computer (used the same prom), Replaced IAC, Crank position sensor, replace three bad injectors, spark plugs fuel pump, fuel filter, battery , alternator, tried doing Idler relearn but it start idling eradicly the shuts down. Its starts back some times or it will crank but will not...
already change fuel pimp and regulator
steering wheel removal. has radio controls on it. thanks