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.
Problems for specific Buick Century years:
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Repairpal verified 1991 Buick Century problems
Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.