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GMC » S15 » 1990 GMC S15 » Car Problems

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1990 GMC S15 Problems

Driveability Problems Due to Internal Distributor Fault

for the GMC S15

The distributor may develop internal faults. This can cause a rough running engine or stalling condition, the Check Engine Light may or may not illuminate. Our technicians tell us that the distributor should be overhauled or replaced to correct this concern.

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Intake Manifold Gasket May Leak Coolant or Engine Oil

for the GMC S15

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.

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Power Window Motor May Fail

for the GMC S15

A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window motor will commonly correct this concern.

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Oil Leak From Distributor Shaft Seal

for the GMC S15

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

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Transmission Output Seal May Leak Fluid

for the GMC S15

The transmission output shaft seal may leak transmission fluid. On 2WD models, this leak can cause the transmission mount to become oil soaked, which will require replacement of the mount along with the leak repair. On 4WD models, if this seal leaks, the fluid will leak into the transfer case, causing it to become overfull.

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Check Engine Light and Erratic Gauge Operation

for the GMC S15

The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require replacement.

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Engine Oil Leak From Valve Cover Gasket

for the GMC S15

This engine may leak oil from the valve cover gasket.

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Coolant Leak From Heater Core

for the GMC S15

The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.

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Coolant Leak & Engine Overheating

for the GMC S15

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

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ABS Light Due to Brake System Control Unit Failure

for the GMC S15

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.

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Power Door Locks Stop Working

for the GMC S15

The power door locks may stop working in one or more doors due to a failed actuator. Replacement of the failed actuator should correct this concern.

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Check Engine Light Due to Oxygen Sensor Failure

for the GMC S15

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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Failed alternator can cause "no charge" condition

for the GMC S15

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.

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