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IAC problem...

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Old Feb 6, 2007 | 05:21 PM
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Default IAC problem...
just as of today my iac is acting up... i was driving home from the shop, beating it pretty good, get off the innerstate, and get to a light and it starts surging pretty good, and i can hear the IAC letting air move thru, but it keeps doing it and when i start to give it gas (while in drive) i can still here it letting air in. is this just a bad IAC?
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Old Feb 6, 2007 | 10:17 PM
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From: Fort Rucker
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do you have a tuner (Hp Tuner/ Efi live). What sound are you referring to when you say "I can here the Iac letting air in" ?
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Old Feb 6, 2007 | 11:13 PM
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Ummm....I've never heard of being able to hear the IAC - especially while driving. Are you sure that's what you're hearing?
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Old Feb 7, 2007 | 03:50 AM
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Check for a Vaccum leak, I could hear it sucking while was trying to maintain idle. I did have the hood up at the time.

My leak was between the PCV value and the intake, its an elbow type rubber hose, the hot oil roke this pipe down and started sucking in air.

Perhaps this is what you hear.
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Old Feb 7, 2007 | 09:04 AM
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Originally Posted by yobabiesdaddy2001
do you have a tuner (Hp Tuner/ Efi live). What sound are you referring to when you say "I can here the Iac letting air in" ?
i cant hear the IAC, but i can hear when it opens and closes, (cause its just a valve), when i left the light its like it stayed open didnt close at all, and when i come to a complete stop, the revs jump up to 2k -2500, sit there for a second then drop down to about 1100, and it surges from there, but i car hear it open and close, sounds like a massive vacume leak, then the leak goes away for about 10 seconds then comes back.. if it starts doing it again ill get video of it, and maybe you guys could give me better input.

i dont have hp tuners, altho i have a buddy that has it.
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Old Feb 7, 2007 | 09:16 AM
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Originally Posted by slowassta
i cant hear the IAC, but i can hear when it opens and closes, (cause its just a valve),
The IAC is a valve but its not just open or closed, there about around 300 steps in between too. Its a stepper motor. If you can hear it opening, perhaps its getting stuck or something.
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Old Feb 7, 2007 | 09:18 AM
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From: Fort Rucker
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does it only do this after coming to a COMPLETE stop or while crusing?
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Old Feb 7, 2007 | 06:02 PM
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only when i stop, i also noticed today that once the car warms up it does it, but only surges from 1k - 1500 rpm, and keeps doing it every 10 -20 seconds..
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Old Feb 7, 2007 | 06:06 PM
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From: Fort Rucker
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Definatly has to be the IAC, if you have not ever messed with the TB. Has the TB been tampered with ie set screw, drill mod etc...?
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Old Feb 7, 2007 | 06:31 PM
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Originally Posted by yobabiesdaddy2001
Definatly has to be the IAC, if you have not ever messed with the TB. Has the TB been tampered with ie set screw, drill mod etc...?
well i just got the car up and running with the LS1, the TB has been ported, drilled, and im pretty sure that the screw has been adjust, (not by me tho)..
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Old Feb 7, 2007 | 08:28 PM
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From: Fort Rucker
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their could be your problem. I myself would need a scanner to diagnose the problem, you may find someone else that can figure it out without a scanner.
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