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Old 03-25-2013, 08:06 PM
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Idle and stalling issue

Hello,
These past few winter months I have had problems with my jeep not idling consistently but sometimes it idles normally. Also during this time it will die, or want to die if I stop at a stop sign to fast. Once I drive a few miles and the engine gets warmed up then it wont want to stall out. I cleaned the throttle body and IAC valve but that did not work. I bought a new IAC valve this weekend but I am still having issues. The new IAC valve did let my jeep idle below 1,000 rpms but it still idles consistently.
Thanks for any help.
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Old 03-25-2013, 09:53 PM
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Re: Idle and stalling issue

Idle issues are mostly due to dirty throttle body and/or IAC motor, or a TPS. Did you check if there was any fault code set by the PCM using the key dance?
You mentioned that with the new IAC the idle is below the 1000 rpm, it should be at 650 rpm. High idle issues or fluctuating idle are mostly caused by the TPS going bad (throttle position sensor).
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Old 03-25-2013, 10:38 PM
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I have not tried the key dance, did not know about it. And it idles between the 600 to 800 rpm range when it decides to bounce around.
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Old 03-26-2013, 06:23 AM
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Re: Idle and stalling issue

The key dance works like this: switch ignition switch OFF/ON 3 times and leave it in ON at the third time. The odometer will show "DONE" when all ok, or the stored fault code(s).
If you have a scanner which shows live data, you could check the TPS position (in %) and see if its a steady value or that it changes a bit. When not completely steady, you have to change the TPS.
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Old 03-26-2013, 08:22 AM
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I just did the key dance and it says done.
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Old 03-26-2013, 09:07 AM
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Re: Idle and stalling issue

I would try changing the TPS. Mine did the same thing a while back and I changed the TPS and all my problems went away. Hopefully this helps you.
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Old 03-26-2013, 09:14 AM
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I think I'll try that. Thank you
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Old 03-26-2013, 10:59 AM
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Re: Idle and stalling issue

Ditto Here!! Except my TB and IAC were horrificlly dirty and sludgy. I also changes the TPS because I was having transmission hunting problems. It is like a brand new truck now!! Idles perfect and shifts perfect!!
Good Luck.
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Old 03-26-2013, 04:22 PM
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Re: Idle and stalling issue

Same here on the tps change
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Old 03-26-2013, 04:46 PM
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Picking one up at O'Riley's soon so we will see what happens.
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Old 03-26-2013, 06:32 PM
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Well I installed the new TPS and I am still having the same problems. Now I am back to the Rome being around 900.
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Old 03-26-2013, 07:12 PM
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Re: Idle and stalling issue

Does it start normally when cold, or does it have to crank longer then normal?
Is the normal maintenance done in time (plugs, air filter)
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