IDLE
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Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
I would disconnect the AC - un-do your changes - and see if the problems disappear.
Postmaster
Joined: Jan 2012
Posts: 3,462
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From: Richmond
If it's an air-through bypass IAC:
Small formed tubing to each side of the throttle. Inside is a valve similar to the piston in a rotary engine. No power is closed, max power is full open. Varies how open it is based on cooling temp, AC, etc etc.
That's what I think is sticking. Especially if the PO of the truck drove it with the AC off most often it makes sense it'd wear out or gum up at that position.
Small formed tubing to each side of the throttle. Inside is a valve similar to the piston in a rotary engine. No power is closed, max power is full open. Varies how open it is based on cooling temp, AC, etc etc.
That's what I think is sticking. Especially if the PO of the truck drove it with the AC off most often it makes sense it'd wear out or gum up at that position.
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Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
Lack of fast idle assist with AC on
A/C does not cut-off under WOT conditions
Surges with A/C on at idle
But none of those match his symptoms.
But seeing those got me to thinking... this problem began when the A/C was serviced, the cause of the problem likely originates there, then.
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Wow, looks like I missed alot of conversation. The truck actually did well today. Idled just fine, no surging or stalling.
I went over to Gary Lewis's today and we installed new axle pivot bushings. One of mine had no rubber left!!! Holy moly. We had a bit of a time installing the first one, but got it figured out and the second one slide right in after heating up the I-beam and using a installing Gary fashioned up.
As for the idle, last night I unhooked the IAC. Then got the truck running without the IAC. Then gradually adjusted the idle screw until the engine would just barely run then die. Then I hooked the IAC back up and let the battery sit unhooked for awhile. Hooked it back up and let the computer do its thing for a couple minutes, then went for a small cruise. It seemed to be doing okay.
The only thing i still notice is when starting cold it fires up, gets sort of close to dieing, then revs up good and slowly comes to a good idle.
I went over to Gary Lewis's today and we installed new axle pivot bushings. One of mine had no rubber left!!! Holy moly. We had a bit of a time installing the first one, but got it figured out and the second one slide right in after heating up the I-beam and using a installing Gary fashioned up.
As for the idle, last night I unhooked the IAC. Then got the truck running without the IAC. Then gradually adjusted the idle screw until the engine would just barely run then die. Then I hooked the IAC back up and let the battery sit unhooked for awhile. Hooked it back up and let the computer do its thing for a couple minutes, then went for a small cruise. It seemed to be doing okay.
The only thing i still notice is when starting cold it fires up, gets sort of close to dieing, then revs up good and slowly comes to a good idle.
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jim2029
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 8, 2008 09:01 PM
