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1990 Cadillac DeVille Problems

RepairPal has identified the most common problems with the 1990 Cadillac DeVille based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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25
Known Problems

The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.

The spark plugs should be replaced every 30,000 miles and the spark plug boots should be checked for hot spots and cracks.

You may be able to prevent transmission problems by servicing the transmission and inspecting the fluid every 30,000 miles. If the fluid is dark or burned then the transmission system should be completely flushed.

The parking brake may not release automatically due to a failed vacuum switch or actuator. Our technicians tell us that if vacuum is supplied to the actuator when the transmission is in gear, the vacuum switch is functioning and replacing the actuator should correct this concern.

Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.

 

The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.

An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.

Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.

The alternator may fail causing the battery to go dead, or an abnormal noise may develop. The dash warning light may or may not illuminate. A failed alternator will require replacement.

Our technicians highly recommend that the fuel filter be replaced every 30,000 miles.