Timing gears can cause knocking sound on Oldsmobile Cutlass Ciera

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.
Problem Data
RepairPal Verified
Average mileage: 250,000 (250,000–250,000)
Engine affected: 2.5L 4 Cylinder
3 model years affected: 1990, 1991, 1992
5 people reported this problem
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