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1990 Chev/GMC Truck c3500 7.4L Fast Idle
Posted to GM Driveability on 10/12/1998

Does anyone know how to lower the idle speed over the factory preset value. The engine idles at 750 rpm and I would like to lower it to 500 rpm. Is there someone who reprograms the proms? Thank You Paul

 
Message Closed w/FIX

car Vehicle Data

1990 Chev/GMC Truck c3500

VIN [No VIN Available]
Engine7.4 L / 8 cyl
EmissionsCA EMISSIONS
SymptomsFast Idle
OccursHot
Misc.Engine Swap
Message Closed w/FIX

car Vehicle Data

1990 Chev/GMC Truck c3500

VIN [No VIN Available]
Engine7.4 L / 8 cyl
EmissionsCA EMISSIONS
SymptomsFast Idle
OccursHot
Misc.Engine Swap