high idle help

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Jul 24, 2004 | 06:29 AM

puckster777

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high idle help

The idle in my bronco is at 2000 at start and come down to 1000 but that low as it gets, Took truck to ford dealer they said to replace thottle body at $357. I replaced the iac no change. Any idea would be helpful thanks
1989 full size with 302

Jul 24, 2004 | 08:51 AM

Jammer77

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From: San Antonio TX

Just asking but have you tried adjusting the throttle body idle adjustment screw? Just asking, firgure start from the basics and work up.

Jul 24, 2004 | 12:39 PM

puckster777

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Yes I have tried putting the adjustment screw all the way in. I took off the throttle body, and cleaned it. Replaced gaskets, intake air temperature sensor and air bypass valve. The idle is still high.

Jul 24, 2004 | 12:52 PM

MatthewC

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From: Fredericton NB, Canada

Have you taken a timing light to it and checked if everything was cool on that end?

Jul 24, 2004 | 02:07 PM

puckster777

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no but the timing has not moved i mark the timing at the base of the distributer
im almost sure it a fuel problem thanks but i will check it out any way

Jul 24, 2004 | 07:21 PM

BOJOFASO

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From: NJ

did this happen all of a sudden? if so maybe you popped a vacumn hose off. or you could chech to see if your idle increase solenoid is stuck out a little bit. are you sure your throttle plkate in your valve body is closing all the way. it may be stuck open the slightest bit.is the gaket on the throttle body good and is the throttle body seating correctly. you may have a warped body. more air means higher idle.

Jul 25, 2004 | 01:16 AM

Brettddglas

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From: Yorba Linda CA

idle solenoid may be stuck or inoperative. Take it off and clean it thourougly with solvent and put it back. If this doesnt help, replace it. They are relatively cheap.