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1989 GMC V3500 7.4L High Idle
Posted to GM Driveability on 4/11/2008 6 Replies

If you start vehicle and let sit and idle everything is ok, runs normal. Put vehicle in drive or reverse and the iac goe to full open 140-145. It takes a few seconds to climb to full open. this action puts the idle at 1700 rpm when put back into park. some tim...

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car Vehicle Data

1989 GMC V3500

VIN 1GTHV33N7K
Engine7.4 L / 8 cyl / GAS
Trans3-speed Automatic
DeliveryFI / tbi
Emissionsus fed
SymptomsHigh Idle
OccursUnder Load, Put in Gear
Message Closed

car Vehicle Data

1989 GMC V3500

VIN 1GTHV33N7K
Engine7.4 L / 8 cyl / GAS
Trans3-speed Automatic
DeliveryFI / tbi
Emissionsus fed
SymptomsHigh Idle
OccursUnder Load, Put in Gear