1990 GMC Vandura 2500 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 GMC Vandura 2500

1990 GMC Vandura 2500 Problems

Intake Manifold Gaskets May Leak Coolant or Engine Oil

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.

Distributor Shaft O-Ring Seal May Leak Oil

An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.

Idling Problems Due to Vacuum Leak in Throttle Body Gasket

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

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