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Resources for the Repair and Maintenance of your 1990 GMC S15

1990 GMC S15

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1990 GMC S15 Problems

Engine -- Verified

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

Engine -- Verified

A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.

Engine -- Verified

The alternator may fail, causing a "no charge" condition. An internal bearing may also fail and cause an abnormal noise. If the vehicle is driven too long with a failed bearing, the alternator may stop turning, which can cause the serpentine belt to break or the engine to stall and not turn over.

Exhaust & Emissions -- Verified

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

Drive Train -- Verified

Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.

1990 GMC S15 Questions and Answers

Visitor, 1990 GMC S15, 2.5L 4 Cylinder, Mineral, VA

I have a 1988 GMC S15 in my shop and it will flood without cranking, only goes 30 mph, fouls spark plugs, and its hard to start hot or cold. We put brand new distributor caps, spark plugs, wires, r...

Visitor, 1990 GMC S15, Beulaville, NC

how do I change rearend oil

joehart, 1990 GMC S15, 2.8L V6, Boise, ID

I have a 1984 GMC S15 HIGHSIERRA 4x4 with extended cab. The Hydrolic clutch pedal has no freeplay and I am concerned about wearing out the clutch plate. Is there a way to adjust clutch pedal to all...

Visitor, 1990 GMC S15, 2.5L 4 Cylinder, Columbia, TN

no code, want run ,starts and dies

ejwilley, 1990 GMC S15, Randle, WA

How do I change heater core ?

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