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Old 12-27-2012, 04:35 PM   #1
05focusST91
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Smile Possible iac?

Driving home today my pedal felt weird at first, then when coming to a stop in gear, the car stalled out but i still had power, even when i put it in neutral coming to a stop this happened, the rpms just shot down. I managed to get it home which isnt far and when i parked it stayed running but at 1000rpms which is way over normal. Any other ideas besides the iac? Without further checking it that seems to be the issue, any input/help is much appreciated, happy almost new years by the way!


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Old 12-27-2012, 06:03 PM   #2
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bump, anyone? im gonna further check it tomorrow but any advice could help
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Old 12-27-2012, 06:50 PM   #3
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Stalling at idle - or difficulty maintaining a set idle speed - is typical of a vacuum leak after the MAF. Immediate stalls usually indicate a big leak from, say, a disconnected or split hose.

I personally wouldn't initially go right to the IAC; I'd say any odd behaviour from the IAC in trying to control idle speed would be more likley to be an effect rather than a cause. Check for the obvious, simple stuff first.
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Old 12-27-2012, 08:15 PM   #4
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thanks, i took a quick peek everything looked ok, ill try to figure it out at work tomorrow, plus i have been getting hard starts every now and then, and i had a hard gas pedal when it first started happening.
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Old 12-27-2012, 08:40 PM   #5
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You can probably ignore the hard gas pedal in this case, it's extremely common for our throttle bodies to stick some in cold weather and it's mostly just an annoyance. Also the IAC tends to stick open causing hanging revs and high idle. You've got the high idle problem but the PCM will intentionally do that if it senses the engine stalling, which would be the case in the event of a serious vacuum leak. I agree with looking for a vacuum leak first.
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Old 12-27-2012, 08:51 PM   #6
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ok thanks, i'll give an update tomorrow once i find something out.
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Old 12-28-2012, 07:33 AM   #7
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if you unplug the iac and the idle dosent change or car doesnt stall you have a vaccum leak. look at pcv hoses and air box hoses good
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Old 12-28-2012, 07:34 AM   #8
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clean your throttle body as well, before you strech out your cable
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Old 12-28-2012, 12:21 PM   #9
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Cleaned the iac, no vacuum leaks, had a code for the maf sensor so i changed it, reset kam and seemed to drive fine, ill found out later, thanks again for the quick responses/help! Happy new years guys.
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