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1995 Chevrolet 3500 Pickup Question: 5.7 motor idles at 1800 rpm. will not drop down til warm and restart.

 

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cabinappin, Mansfield, OH, March 19, 2013, 03:50
 Rookie

then it takes about 20 seconds to idle down to 800 rpm. have replaced all components with no luck

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  • Answer #1

    pushrod March 19, 2013, 04:30
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     Master

    Vacuum leak or IAC, air is getting inside of the intake from somewhere it isn't supposed to!! Or to much form where it is supposed to.
    Good scanner and operator can find this problem. Not a parts store employee with a code reader.

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