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1991 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire
Posted to GM Driveability on 9/18/2000

This vehicle will idle well, then, without apparent cause, begin bucking, spark knocking, and smelling horrible. Despite acting this way, it will not set a code.

The ECM failed a tap and wiggle test and was replaced. The problem persisted, though a little les...

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car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B2M
Engine4.9 L / 8 cyl
EmissionsUS FED
SymptomsPoor Idle Quality, Hesitation, Surge, Cuts Out, Stall, Misfire
OccursCold, Hot, Cruise, Idle, Intermittently
Message Closed w/FIX

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B2M
Engine4.9 L / 8 cyl
EmissionsUS FED
SymptomsPoor Idle Quality, Hesitation, Surge, Cuts Out, Stall, Misfire
OccursCold, Hot, Cruise, Idle, Intermittently