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Old 03-19-2012, 04:46 PM   #1
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Question Stalling at Idle

I've read some of the idle problems other members have posted; I have made some changes and still experiencing stalling at idle at some stops once in a while. I removed the throttle body and thoroughly cleaned it and related components, I replaced the TPS and the CPS. I have noticed, not 100% sure, that I have more stalls when my fuel tank is at half or less than half, I'm pretty sure I've never had the engine stall on a full tank. Could my pump be on its way out? My jeep only has 85k miles on it. I need help, please advice. Thank you in advance.

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Old 03-19-2012, 04:50 PM   #2
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Whatever it is, it's not fuel level related. When you removed the throttle body, did you also remove and clean the IAC (idle air controller)? A dirty IAC is the usual cause for a bad idle, followed by a dirty TPS (throttle position sensor). A dirty IAC is easily cleaned which restores it back to operation. A dirty TPS can only be replaced.

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Old 03-19-2012, 05:06 PM   #3
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Whatever it is, it's not fuel level related. When you removed the throttle body, did you also remove and clean the IAC (idle air controller)? A dirty IAC is the usual cause for a bad idle, followed by a dirty TPS (throttle position sensor). A dirty IAC is easily cleaned which restores it back to operation. A dirty TPS can only be replaced.
I did clean the IAC, made a mistake though, I did remove the stem and sleeve. Replaced the TPS. I have seen the check gauges light and check engine light light up when it stalls but they don't stay lit. I had the Jeep scaned but no codes. I'm baffled.
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Old 03-19-2012, 05:11 PM   #4
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I did clean the IAC, made a mistake though, I did remove the stem and sleeve.
That confused me, is there any chance the IAC isn't working properl after whatever that mistake was? The IAC is the component that is most reponsible for how well and at what RPM the engine idles.
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Old 03-19-2012, 05:36 PM   #5
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That confused me, is there any chance the IAC isn't working properl after whatever that mistake was? The IAC is the component that is most reponsible for how well and at what RPM the engine idles.

I dis assembled the valve, I think I read one of your postings where you indicate not to do so, just after I did. So, how can I test the valve for failure? Or do I just replace? What would that run me? What else can I look for?
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Old 03-19-2012, 05:38 PM   #6
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Check the flywheel for cracks, The crank sensor could be off. That is a hard problem to find.

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