bad IAC valve?
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Joined: Jan 2007
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bad IAC valve?
Hello again,
Recently when i start my truck it will idle up to about 1500rpm for a second and drop to low idle, almost choking its self, will stay low for a second or two and come back up.. is this normal? or is it a sign that the IAC is going? Not too sure what to think of it cap and rotor was replaced about 4000 miles ago and this little prble started mayb 3500 miles ago. Any idead? suggestions?
Recently when i start my truck it will idle up to about 1500rpm for a second and drop to low idle, almost choking its self, will stay low for a second or two and come back up.. is this normal? or is it a sign that the IAC is going? Not too sure what to think of it cap and rotor was replaced about 4000 miles ago and this little prble started mayb 3500 miles ago. Any idead? suggestions?
Elder User
Joined: Sep 2005
Posts: 841
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From: Orangeville, Ontario
The best thing you could do is check your codes. I have the same issue and it isn't constant and I went ahead and replaced the IAC and low and behold.. no change. I've heard that a racing/fluctuating idle can sometimes be attributed to a bad EGR valve. But I'm waiting on delivery of a code reader so we'll see.
Junior User
Joined: Dec 2006
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My '93 had been doing the same thing for quite a while. I recently had to replace the ACT sensor and have not had the problem since. Another possibility for you to check.
Last edited by akaGWall; Oct 1, 2007 at 02:40 PM.
Senior User
Joined: Jul 2006
Posts: 173
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From: Victoria BC, Canada
If you clean the Iac valve, clean the T-body too. Intake cleaner and a toothbrush. Disconnect the batter to erase the Idle stratagey, so it will relearn.
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Elder User
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Junior User
Joined: Dec 2006
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Hey, Road Virus...ACT refers to Air Charge Temperature sensor. It is also referred to as IAT (Intake Air Temperature?)I think. I bought the part at Napa and they list is as Air Charge Temperature. My Haynes manual uses both terms.
Senior User
Joined: Nov 2006
Posts: 310
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From: West Chester Pa.
Mine idle was all over the place, and stalling, a year or so ago. I replaced the throttle position sensor about $60 and cleaned the throttle body It's been great ever since. The book says do not clean the throttle body because it has a coating. I did it anyway, what's the alternative.
Senior User
Joined: Jul 2006
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From: Victoria BC, Canada
The coating thing that ford does is a bunch of crap, its supposed to protect against carbon buildup, but it doesn't do its job at all. I ve probably cleaned hundreds of those throttle bodies, with no ill effects.
Senior User
Joined: Nov 2006
Posts: 310
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From: West Chester Pa.
Originally Posted by parrisw
The coating thing that ford does is a bunch of crap, its supposed to protect against carbon buildup, but it doesn't do its job at all. I ve probably cleaned hundreds of those throttle bodies, with no ill effects.
Junior User
Joined: Mar 2003
Posts: 98
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i dunno about cleaning a IAC ..... personally I've never had luck doing it . If there is carbon in the TB around the plate .... spray cleaner on a rag and rub it until its clean . That will probly cure the surging .
Elder User
Joined: Sep 2005
Posts: 841
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From: Orangeville, Ontario
Originally Posted by akaGWall
Hey, Road Virus...ACT refers to Air Charge Temperature sensor. It is also referred to as IAT (Intake Air Temperature?)I think. I bought the part at Napa and they list is as Air Charge Temperature. My Haynes manual uses both terms.