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Old 01-24-2013, 09:58   #1 (permalink)
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Poor Idle (sometimes dies)

So when I go to stop or am stopped, my idle drops very low, bounces and sometimes dies. I have changed the IAC and the MAF. I have not reset the PCM though. I haven't really noticed anything with the hoses, but I haven't really inspected thoroughly. Any ideas?
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Old 01-24-2013, 12:43   #2 (permalink)
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Re: Poor Idle (sometimes dies)

What year, engine, etc. Autozone will pull codes for free. Don't reset it before you go.
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Old 01-25-2013, 04:32   #3 (permalink)
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Re: Poor Idle (sometimes dies)

The problem you are describing in most cases is a bad IAC (idle air control) valve and or a dirty throttle plate and throttle body. Since you changed the IAC valve, the problem could be with throttle plate. You can clean it with a good brand of carb cleaner. If cleaning doesn't work, then run this test on the IAC. Check Idle Air Control (IAC) solenoid function - backprobe the WT/LB wire of the Idle Air Control (IAC) solenoid with a jumper wire. With the engine idling, momentarily ground the other end of the jumper and the idle should flair high. Inspect the throttle bore for gum and varnish deposits. Hope this helps.
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Old 01-26-2013, 10:20   #4 (permalink)
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Re: Poor Idle (sometimes dies)

Depending on year, make, and model, you'll have some variations, but the following link will take you trough throttle maintenance. Make sure you've taken care of any vacuum leaks, first.
Ford Mustang IAC IAB - Solving your idle problems
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