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1990 Buick LeSabre 3.8L MIL Lamp on
Posted to GM Driveability on 12/9/1997

Code 65 reappears after about a week of retesting. The way I understand it, the ECM will selftest this system on coastdown. It opens each channel of the valve and expects to 'see' changes in idle speed, vacuum, LV8, etc... Sooo the the proper response isn't be...

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car Vehicle Data

1990 Buick LeSabre

VIN 1G4CW54C1L
Engine3.8 L / 6 cyl
EmissionsFed.
SymptomsMIL Lamp On
OccursIntermittently
Message Closed

car Vehicle Data

1990 Buick LeSabre

VIN 1G4CW54C1L
Engine3.8 L / 6 cyl
EmissionsFed.
SymptomsMIL Lamp On
OccursIntermittently