IAC problem possibly
Retired Moderator - RIP
Joined: May 2008
Posts: 18,729
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From: NH
IAC can be tested with a scanner such as Snap On MT 2500. It is a stepping motor, so no other way to test other than for something to send it pulses and count the steps.
IAC can be tested. It is a potentiometer and can be tested with an ohmmeter. Make sure the resistance changes smoothly while rotating it. (with it removed and no power on it).
IAC can be tested. It is a potentiometer and can be tested with an ohmmeter. Make sure the resistance changes smoothly while rotating it. (with it removed and no power on it).
Mr grouchy 
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Amateur
Joined: Jan 2007
Posts: 30
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From:
Just wanted to update. Truck would not idle at all this morning and disconnecting and reconnecting the battery did nothing, so I went ahead and replaced the IAC today with one from NAPA (About $35.00) and it runs perfect again. Appreciate the help and suggestions. Good to have it running again like it should..
Legend
Joined: Jun 2009
Posts: 8,025
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From: orangeville ontario
don't throw out the old one. you may want to clean it and set it aside just in case. those cheap ones have a tendency of failing. i think Wombat Ranger went through 2 or 3 and was lucky they had the big chain store warranty on them so they were replaced for free.
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Amateur
Joined: Jan 2007
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I kept the old one and the new one has a year warranty on it. I also saw where the cheap ones failed alot, so at least if it does, I can return it. But at least I know what the problem is now. So are the only good ones factory?
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
the factory ones tend to be better quality but they are expensive to replace. plus in most cases the stock one does not really fail. it just gets really dirty and stops working but in most cases if you clean them up they will usually work fine again. i know i saved my mom $400 by cleaning the IAC on her Honda. it only took a few minute to clean with some break cleaner once i got it out.
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Amateur
Joined: Jan 2007
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I cleaned the old one first, but it didn't help. Hopefully this solved the problem and it will last for a while. I noticed when I pulled the old IAC out that the "pintle" was fully extended and closing off the airflow to the throttle body. Would that be the normal position when the truck is shut down?
Administrator
Joined: Apr 2010
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From: Clayton MI
New ones will be at least partially retracted, so your aren't trying to force the pintle in, when you are tightening the sensor down. Have to disconnect the battery, to reset the PCM, so that when you next try and start, the PCM will "re-zero" the IAC. (and any other sensors....)