A coolant leak may develop from the water pump. The engine may overheat as a result of the coolant loss. A leaking water pump should be replaced.
1990 Buick Century Problem Reports
Most Reported 1990 Buick Century Problem Reports
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Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.
Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.
The front struts may show signs of wear, or be excessively bouncy ride at freeway speeds. This may begin to occur at around 75,000 miles.