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amcculloch
New User
Apr 11, 2007, 9:15 PM
Post #1 of 2
(1601 views)
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i have a 1989 gmc 3500 box truck with the 454 got it from a friend for free it sat for about 2 years i replaced the fuel pump and drove it home but it wont idle down i cant figure it out i cleaned the throttle body and it didnt work any suggestions
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way2old
Veteran
/ Moderator
Apr 12, 2007, 5:38 AM
Post #2 of 2
(1596 views)
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Re: 1989 gmc idle
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If it is idling really high, look down in the throttle body and see if you can see a small part of the intermediate gasket on the throttle body that has been sucked inside. This will cause a vacuum leak and the ECM is compensating with more fuel. More fuel and more air equals more rpm's.
Being way2old is why I need help from younger minds
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