1990 GMC Vandura 2500 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 GMC Vandura 2500
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1990 GMC Vandura 2500 ProblemsHighter Than Nornal Idle Due to Vacuum Leak
An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.
The alternator may fail causing the battery to go dead. The charge light on the dash may or may not illuminate. The alternator may also develop an abnormal noise. A failed alternator will require replacement.
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. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
1990 GMC Vandura 2500 QuestionsWhere is the PCM located (1 answer)
My van is actually a 1986 - could not denote earlier year than 1990
1988 gmc vandura I'd it on a timer or something the on Motion won't shot it off