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1989 GMC C3500 7.4L Excesive Idle Speed
Posted to GM Driveability on 10/14/1998

This vehicle will idle at normal speed (600 rpm) in park or neutral. When the vehicle is shifted to a drive gear, the IAC counts are pushed over 100 and the idle speed is driven to 800 rpm. When shifted back to park or neutral, the idle speed remains high and ...

 
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car Vehicle Data

1989 GMC C3500

VIN 1GDGC34N6K
Engine7.4 L / 8 cyl
EmissionsCA emission
SymptomsExcesive Idle Speed
OccursHot
Message Closed

car Vehicle Data

1989 GMC C3500

VIN 1GDGC34N6K
Engine7.4 L / 8 cyl
EmissionsCA emission
SymptomsExcesive Idle Speed
OccursHot