i need some help

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May 4, 2007 | 05:05 PM

rustee90-150

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From: watford, ontario

i need some help

i have a 90 f150 302 its idling poorly it normally idels at 7000 if i just touch the throtle a little bit say bring it up to 8000 quickly it idles back down but goes down to about 500 then bounces around from 5 to seven it does that for a minute then settles back down at 7000 i changed the idle air control motor with one of another of the same truck and it still did it . anyone know or have an idea of whats going on ? thnxs shawn

May 4, 2007 | 05:18 PM

quicklook2

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From: Lakewood, Ohio

idles at 7000 rpm!!!

i do not think so, nor does it rev to 8000 rpm.

May 4, 2007 | 06:30 PM

rustee90-150

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From: watford, ontario

sorry one to many zeros

May 4, 2007 | 08:20 PM

Popa Tim

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From: Central NY

check for vacuum leaks

May 4, 2007 | 11:54 PM

eric f150

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From: Grand Valley, On

MAP sensor?
try unpluging it and see what happens.
Good Luck

May 5, 2007 | 06:31 AM

rustee90-150

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From: watford, ontario

ive checked for vacuum leaks couldnt find any. where is the map sensor?

May 5, 2007 | 07:05 AM

eric f150

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From: Grand Valley, On

on the firwall about the pasenger side windshield wiper, it has a little plug and a vacum line, ive heard not to unplug or plug stuff like that bake in while its running, so i would saystart it then unplug it and restart it again and see if theres any difference.