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Old 10-12-2019, 07:41 AM   #31
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If it were a vacuum leak it would roam at any idle load or not. My issue only happens with load like AC or quick turn of steering. Without load, it idles fine.
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Old 10-12-2019, 02:28 PM   #32
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'If it were a vacuum leak it would roam at any idle load or not.'

You'd think that, but then you would likely be wrong. There are so many ways they can present it is not funny. BTDT.

There is not a lot of idle trim fuel range on these. When the engine lowers rpm more the IAC has to open more trying to correct it and the PCM has to add more fuel to cover that, it can then hit the idle fuel trim limit and motor goes whacky because there is no more fuel. At normal idle speed the IAC has to add much less air, it may even have to take away air because of the leak and the fuel trim then covers it.

Some of that depends on where the TB aircrack is as well, that physical location is closely linked with IAC ranging, whether it has to go high or low to control idle speed.

You can have a vacuum leak, and as long as it is within fuel trim range the PCM will accept the fast speed and simply drop it back to normal using the IAC. Once you pass the fuel limit is when the leak begins to mess the idle quality up in roughness. You get closer to that the more the IAC has to open, or the bigger the vacuum leak gets.
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Old 10-13-2019, 08:08 AM   #33
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So if this is from a vacuum leak, any suggestions on finding it?
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Old 10-13-2019, 03:45 PM   #34
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Theres not an IAC on these just straight etb
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Old 10-13-2019, 04:57 PM   #35
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Quote:
Originally Posted by amc49 View Post
You get closer to that the more the IAC has to open, or the bigger the vacuum leak gets.
As stated, there's no IAC on 08-11 cars.

Check your alternator/battery health. Roaming idle is constantly coming up as a common 'issue' on these cars though I have never ever seen it on my 11 SES with over 100k miles.

My "educated guess" would be that there's some electrical issue stemming from the battery/charging system that causes issues with idle.

Battery and alternators are free to check at most auto part stores everywhere.
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Old 10-13-2019, 06:05 PM   #36
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See, I'm having an issue with mine dropping way to low and my car stalling while in park or at idle and then park and idle when my rad fan kicks on it's like my engine takes a fat hit of crack and losses its shit until the fan shuts off
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Old 10-13-2019, 06:14 PM   #37
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I will say do not use an aftermarket throttle body. I made that mistake ( an expensive one at that) my car would get stuck at 1500 rpms when ever I'd rev the engine and ultimately never fixed my idle hunt either
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Old 10-13-2019, 06:15 PM   #38
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And well my car never actually stalls either it's just feels like its gonna stall
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Old 10-13-2019, 11:54 PM   #39
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There is no difference in IAC type engine idle control or TB only, the electronic TB has to move the butterfly in the same way the IAC moves a pintle.

Just fixed a Nissan electronic TB with no IAC using the same ideas.

Last edited by amc49; 10-13-2019 at 11:57 PM.
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Old 10-14-2019, 12:14 AM   #40
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Whatd you do? If you dont mind me asking
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