1994 Cadillac DeVille Problem Reports

Most Reported 1994 Cadillac DeVille Problem Reports

Report A Problem
View:Most ReportedNewestRepairPal Verified

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

 

This powertrain control module (PCM) may develop a fault with its electrical ground location at the front of the engine block near the starter motor.

An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary to pinpoint the cause in order to make the correct repairs. A "smoke" machine is often used to isolate the cause of difficult to find vacuum leaks.

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.

 

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

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.

The oil pressure switch and timing cover gasket may develop an engine oil leak.

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

Excessive carbon build up in the engine combustion chambers may be the cause of a smog check failure due to excess NOx emissions. A "top engine" decoarbonization cleaning procedure will commonly correct this concern.