I've been having idle issues. My idle is hunting all over the place! I had attempted to set the min. air position and I had no change in my idle quality. I started thinking and I took the IAC out of the throttle body. I cleaned it, pushed the pintle most of the way into the IAC and also put a few drops of machine oil on the pintle prior to installation. I then jumped the terminals of the aldl a and b. Pluged the IAC in and Turned the car on and watched the IAC pintle. I could feel the IAC vibrating, but there was no movement of the pintle? IF I pushed on one side of the pintle, it would kind of move, but I really had to help it along! So I'm wondering if the IAC is bad becausethe pintle will not move unless I push it with my finger???

Anyone?

 

Did you clean inside the IAC, where the stem of the pintle rack gear resides? If it's thoroughly cleaned, lightly lubricated, and the ECM is phasing the coils correctly, it should step the pintle inward and out. If not, you may have a bad IAC.

 

Vader,

Thank you for the reply! Yes, i beleive the IAC is bad because there is no movement of the pintle. I pushed the pintle all the way in to teh iac and the idle was very high and the idle did not hunt at all. With the pintle all the way out, it was hunting really bad. And no movement with teh car in diagnostic mode showed no movement of the pintle. I could feel it vibrate, but no movement.


Also, could a bad IAC make my car run really rich?

I'm getting a new IAC tomorrow and will keep ya posted.

Thank you again for the reply

 

IAC can only contrl fuel mixture to the extent that it will not allow bypass air into the plunum. If the ECM is driving injectors at a given rate at idle, and the IAC is not allowing bypass air at idle, the mixture would tend to be rich until the ECM sould compensate. That isn't likely with a MAF setup nor with a SD with correct programming. The rich issue is probably something else, but since you know the IAC is a problem, repair that first.

 

Vader,

First of all, THANK YOU for your help! Turns out the IAC was bad. I cleaned my IAC and it would not move the pintle at all. I got a new one and it runs perfect.

Thanks again!

 

A good IAC will shoot the pintle out if there's nothing to stop it. Hold it an inch away from somthing solid when testing.

 

Yea, I did that. The old one would vibrate but the pintle would not move at all. I cleaned it and still nothing. got a new one and my car now runs perfect.