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GMC S15 Problems

Timing gears can cause knocking sound on GMC S15

Problem Description and Possible Solution

Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.
(1 person reported this problem)

GMC S15 Vehicles With This Problem

RepairPal Verified
Average mileage: (–)
Engine affected: 2.5L 4 Cylinder
1 model year affected: 1990
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Brake problem? Or maybe a faulty head gasket cylinder?
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