high idle problems.... - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 2 (permalink) Old 10-14-05, 04:01 PM
darkshadow94
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high idle problems....

i replaced the throttle position switch and adjusted the throttle screw and
it still idles between 1500 to 2000 rpms.. anyone know how to fix this
problem???



 
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post #2 of 2 (permalink) Old 10-14-05, 06:01 PM
Backyard Mechanic
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Re: high idle problems....

"darkshadow94" <amistyxx@hotmail.com> wrote in
news:2e48650a2d78176a42129c4ff8933370@localhost.talkaboutautos.com:

> i replaced the throttle position switch and adjusted the throttle
> screw and it still idles between 1500 to 2000 rpms.. anyone know how
> to fix this problem???
>



The PCM controls the idle speed. But now you've screwed the basic setting
up.
You probably have a vacuum leak. Set that screw till it just opens the
butterfly
Remove and clean the ISC. Reinstall check idle

Disconnect all vac fitting to the intake except fuel pressure reg, plug the
intake vac ports.
Check idle, if right..Warm the engine up, disconnect the IdleSpeedControl
harness, and adjust the screw back to 500 rpm.
reconnnect ISC and attach vac lines one by one

If not right, you probably have an intake leak.. use choke cleaner or unlit
propane around all mating surfaces
 
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