99 Cobra idling problems, help =( - Mustang Evolution

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Old 03-02-2011, 12:54 PM   #1
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99 Cobra idling problems, help =(

I have no problems driving it or anything but when i pull it out of gear and cost to a light or a stop sign in neutral, it idles up to and around 1300 while im rolling and then when i come to a complete stop it goes down to 1000. sometimes, when i do come to a stop itll go up and down constantly between 900 to 1300. on a good day it will stay consistant at 1000. i feel like its affecting my performance, why is it doing this?
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Old 03-02-2011, 12:59 PM   #2
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Re: 99 Cobra idling problems, help =(

well it can be a couple of things, I would start by cleaning my MAF sensor REALLY good especially if you have an aftermarket filter/intake that requires oil (and even more so if you have since oiled it) as gunk gets on it

After that the idle bypass valve (IAC) on the throttle body area, little round looking thing. Needs to be cleaned or replaced as it controls idle in neutral.

The final step if that is not solved it is the tune can adjust the idle decay rate (rate the rpms come down in neutral or after a rev) this can be adjusted.
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Old 03-02-2011, 01:05 PM   #3
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Re: 99 Cobra idling problems, help =(

Yea my engine light went on about a year ago and it was for my IAC but I had gotten that replaced, well supposedly considering I don't go to that mechanic anymore cuz they are horrible. Anyways during the winter it would sometimes bog down and shut off on my first startup after a couple hours till I got that fixed. Then it eventually started doing it again and this winter it did it just like it was before I got that rreplaced. So I'm guessing MAF sensor?
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Old 03-02-2011, 01:06 PM   #4
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What mods have u done? Kind of sounds like an air leak.
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Old 03-02-2011, 01:09 PM   #5
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Re: 99 Cobra idling problems, help =(

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What mods have u done? Kind of sounds like an air leak.
65mm tb, shorty headers, bbk xpipe, slp lm1 cat back, jlt cai.
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Old 03-02-2011, 04:48 PM   #6
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Quote:
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65mm tb, shorty headers, bbk xpipe, slp lm1 cat back, jlt cai.
Check to make sure u don't have a leak between your MAF and your throttle body.
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Old 03-03-2011, 05:36 PM   #7
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Happened to me. Replaced my IAC and it was fixed.
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Old 03-03-2011, 05:40 PM   #8
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Re: 99 Cobra idling problems, help =(

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Happened to me. Replaced my IAC and it was fixed.
Mine wasn't =( lol
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