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1991 Cadillac DeVille 4.9L MIL Lamp on
Posted to GM Driveability on 12/3/1999

With scanner hooked up codes 30 Idle speed control and 91 Park/N are displayed and the Rpm are about 3,000 and then after awhile,the idle will return to normal for a while then it may take off again, also these codes will go away at times, untill you kill ...

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car Vehicle Data

1991 Cadillac DeVille

VIN 1G63D53B7M
Engine4.9 L / 8 cyl
SymptomsMIL Lamp On
OccursAlways

Trouble Codes

30Idle Speed Control
91Park/N Switch
Message Closed

car Vehicle Data

1991 Cadillac DeVille

VIN 1G63D53B7M
Engine4.9 L / 8 cyl
SymptomsMIL Lamp On
OccursAlways

Trouble Codes

30Idle Speed Control
91Park/N Switch