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1990 Cadillac DeVille 4.5L Improper Idle Speed
Posted to GM Driveability on 8/30/2000

This is a good one...I've been chasing this problem for a week now. The car came in with a idle speed problem. The ISC is holding the throttle open to 1700 rpms on decleration until you get the speed below 5 mph then it lets it go down to where it belongs. Thi...

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car Vehicle Data

1990 Cadillac DeVille

VIN 1G6CD5339L
Engine4.5 L / 8 cyl
EmissionsCa Emissions
SymptomsImproper Idle Speed
OccursOn Decel
Message Closed

car Vehicle Data

1990 Cadillac DeVille

VIN 1G6CD5339L
Engine4.5 L / 8 cyl
EmissionsCa Emissions
SymptomsImproper Idle Speed
OccursOn Decel