1988 Chevy Truck High Idle

1988 CHEVROLET TRUCK
51,586 MILES • 6 CYL • 4WD • AUTOMATIC
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PEGAN
  • MEMBER
  • 2 POSTS
I have replaced plugs,cap,rotor,wires,ECM, throttlebody gasket (sucking air).
Idle at start up is around 2000 rpm and stays pretty steady.No codes come up on the scanner.
Nothing seems to change rpm.Any Ideas Please.
May 23, 2008 at 4:11 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
does idle go down when the vehicle warms up any? or does it stay high all the time?

disconnect the IAC that help? check for vaccum leaks.
May 23, 2008 at 5:47 AM
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PEGAN
  • MEMBER
  • 2 POSTS
stays at around 2000 rpm can't get it to idle down.
disconnected IAC no diffrence.
May 23, 2008 at 5:56 AM
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