5.0 idle problems

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Feb 5, 2009 | 11:46 AM

gvsu141

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5.0 idle problems

i have a 1994 e150 van with the 5.0 in it. when at idle, it will constantly rev up and down on its own, frequently stalling because it revs so low. does this sound like the iac valve? also, where is it located on the 5.0?

Feb 5, 2009 | 12:07 PM

Lazy K

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Go to fordfuelinjection.com for good information on everything about the IAC valve and also look for any possible vacuum leaks.

Feb 5, 2009 | 12:09 PM

Freightrain

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From: Ohio

Could be, as if it's sticking, it could cause stalling.
It's usually mounted right at the throttle body. It's a metal can, about 1" dia, 3" long, with two pin plug in the end. Takes two small bolts to remove from intake. You'll see it has two 1/2" diameter holes and a "valve" inside. Get some carb cleaner and clean out all the soot and using a very small screwdriver you can move the "valve" portion against the spring. Make sure it's free and clean.

Reinstall and see if idle smooths out.

Feb 5, 2009 | 12:12 PM

tseekins

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I replaced the IAC on my truck a few ago and it stopped the problem. It's located next to the throttle body.

Tim

Feb 5, 2009 | 02:32 PM

gvsu141

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how far is the valve supposed to move? i cleaned it and it moves a little, but i dont know how far it is supposed to move.

Feb 5, 2009 | 02:54 PM

Freightrain

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Just enough to open/close. That's all it's suppose to do. It just needs to be "free" so it doesn't hang up. I forget which way it's sprung? Closed? Make sure it moves easily and closes fully.

Feb 5, 2009 | 05:26 PM

gvsu141

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thanks, it was stuck in the closed position and won't free up good enough even with a cleaning. i used the one from my bronco to test it and it ran perfectly. guess ill be getting a new one tomorrow.

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Feb 6, 2009 | 07:44 AM

Freightrain

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From: Ohio

Glad to hear you got it figured out. Those little things are the DEVIL when it comes to idling. Your O2 sensor was playing heck trying to keep up with it and that's the reason for the surging. The IAC handles it quicker with just a shot of air to lean it out and keep it steady.