Symptom --- IAC?
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Junior User
Joined: Dec 2006
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From: Richmond
Symptom --- IAC?
1992 F150 5.0 2wd Auto
When starting the truck cold, it starts, idles down almost to the point of dying, then picks back and idles high until warm when idles back to normal. There are some instances where I must give it gas to keep it from dying.
Friend suggests an Idle Air Control valve issue, however I am not sure that Ford has any such part.
Looking for suggestions right now...no codes.
Thanks,
Rick
When starting the truck cold, it starts, idles down almost to the point of dying, then picks back and idles high until warm when idles back to normal. There are some instances where I must give it gas to keep it from dying.
Friend suggests an Idle Air Control valve issue, however I am not sure that Ford has any such part.
Looking for suggestions right now...no codes.
Thanks,
Rick
Senior User
Joined: Aug 2007
Posts: 364
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From: Ca
Yes, your truck does have an IAC valve. It's on the throttle body behind the intake tubes. Take it off and see if it's dirty first. As far as codes, did you actually try pulling them or is it just that the CEL isn't on?
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Junior User
Joined: Dec 2006
Posts: 80
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From: Richmond
Yes, I pulled codes using the jumper method. CEL is not on after the truck starts, nor has it come on during the operation of the truck.
I will pull it off and see if it's dirty...
Would it cause that kind of symptom? I couldn't find it in my Haynes manual. Does it go by another name by Ford?
Thanks,
Rick
I will pull it off and see if it's dirty...
Would it cause that kind of symptom? I couldn't find it in my Haynes manual. Does it go by another name by Ford?
Thanks,
Rick
Posting Guru
Joined: Jul 2009
Posts: 1,069
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From: Toledo, Ohio
It might be the map sensor. I bought a 1987 and when I started it, it would idle, drop to almost dying, catch itself, idle high, drop, catch. Sometimes it would die but if I gave it gas it was always fine. When it was warm it was fine. I replaced the IAC and it kept doing it. Then I replaced the TPS (the new TPS was bad from the store so I put the old one back on) I replaced the MAP sensor and it fixed it for good.
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Try Idle Control Bypass
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Posting Guru
Joined: Nov 2008
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From: Pennsylvania Wilds
Know an '87 that did something very similar when the IAC was bad. After running for a few minutes, it would just keep idling high. If I put it in gear, it'd idle high enough to lock the TC up and move the truck at a decent clip.
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