Cold Start/ Idling issue - Mustang Evolution

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Old 09-12-2011, 10:55 AM   #1
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Cold Start/ Idling issue

When my motor is cold it will start up fine but it will not idle. I turn the key, it starts, but then dies immediately. I can rev it and keep it running and drive it and as i drive it the idle will get better with time. It will start to idle roughly, then as a little more time passes it will eventually idle up normally. With cold weather approaching i am afraid it will only get worse. I would think it is probably just a sensor or relay going bad somewhere but i was hoping someone on here may be a bit more knowledgable. Thanks!
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Old 09-12-2011, 12:16 PM   #2
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Could be the idle air control (IAC). Mine was bad and the car wouldn't idle correctly. It is a cheap part and easy fix. I would start there and see where it gets you.
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Old 09-12-2011, 01:10 PM   #3
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Re: Cold Start/ Idling issue

Okay ill give that a shot. Thanks!
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Old 09-12-2011, 02:24 PM   #4
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Re: Cold Start/ Idling issue

does it happen to be wet out every cold start up?
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Old 09-12-2011, 06:39 PM   #5
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Idle air control valve!!! No need to replace just clean it out with some carburetor cleaner, if you can run a brush through it and blow out any remaining debris with compressed air and should be good as new. Theres just a lot of carbon build up gunking it up. Same thing happened to me about 2 years ago.
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Old 09-12-2011, 07:52 PM   #6
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Where is this located!
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Old 09-12-2011, 08:43 PM   #7
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Quote:
Originally Posted by CodyNelson
Where is this located!
It is bolted to the front of the intake plenum. Two bolts hold it on i think. There Is a hose attached to it that goes from the IAC to the CAI.
Look right behind the alternator in this pic.


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Old 09-16-2011, 08:08 AM   #8
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Re: Cold Start/ Idling issue

Hey guys havent gotten paid yet to buy the IAC yet. But it is starting to idle a little bit rough all the time now. It will be fine then randomly drop and bounce between 500 and 800. Is this still signs of the IAC?
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Old 09-16-2011, 08:32 AM   #9
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Quote:
Originally Posted by CodyNelson
Hey guys havent gotten paid yet to buy the IAC yet. But it is starting to idle a little bit rough all the time now. It will be fine then randomly drop and bounce between 500 and 800. Is this still signs of the IAC?
Yep still the signs. Do what I said above in my last post 1st it will save u a lot of money. It's just clogged up.
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Old 09-16-2011, 08:35 AM   #10
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Re: Cold Start/ Idling issue

so just unbolt it, and shoot it with some carb cleaner? sounds easy enough lol
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Old 09-16-2011, 10:18 AM   #11
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Quote:
Originally Posted by CodyNelson
so just unbolt it, and shoot it with some carb cleaner? sounds easy enough lol
Yea shine a light down it to check how much more carbon build up is in there. Shake out excess carb cleaner air it out good and bolt it back up should work. But make sure you clean it out real good or you will have to repeat the cycle again.
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Old 09-24-2011, 11:34 AM   #12
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Also make sure your base idle is correct, I honestly just had that problem a week ago, just shot some carb cleaner into the iac and it's runs awesome again.
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