1990 GMC S15 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 GMC S15

1990 GMC S15 Problems

Oil Leak From Distributor Shaft Seal

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

Timing gears can cause knocking sound
Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.
Check Engine Light Due to Oxygen Sensor Failure

The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).

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