Low Idle Then Stall

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J33Pfan

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02 4WD V6 Unlimited 160k Miles

I'm so glad I fixed my High Idle problems!!! Now I have a Low idle problem.

The High idle problem was resolved by replacing both bank 2 O2 sensors and replacing the cracked Passenger PVC hose to the rear of the engine. I also cleaned the IAC unit.

Now I have a Low idle problem. Stalls out at the light or in park sometimes. No error codes at all!

Where should I start??
 
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LibertyTC

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Engine light On? Any stored codes ?
The IAC controls idle, did this problem immediately happen after cleaning the IAC?
 

J33Pfan

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Engine light On? Any stored codes ?
The IAC controls idle, did this problem immediately happen after cleaning the IAC?

No to the IAC. No engine light or error codes at all. Occasional the idle dropped ten stalled before I did anything. It was hard to tell with the idle going up to 2000 RPMs at times.

When I replaced the cracked PCV hose the idle dropped to a normal level. Few days later after warm up, it started to go low then lower and stall if you dont tickle the throttle.
 

J33Pfan

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J33Pfan

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I do not know how well you cleaned the IAC & port, but take a look at post # 10 https://www.jeepkj.com/threads/idle-air-control-no-screws.44826/
Even though I have cleaned the IAC before, I eventually just bought a new Mopar one.

It would also be helpful to have the year of your KJ added to your signature line..

Great News! I changed the old Mopar IAC with a new Mopar IAC. No more stalling for over 10 days.
I did try a 3rd party lower cost IAC but the O-ring was too big. It didn't install right and gave me lots of codes. I had to pull it out right away and use a new Mopar IAC.

After installation, I disconnected the battery for 30 secs. Took it for a 20 min drive on the highway.
It started up & ran fine, no problems.

Thanks for your help!
 

LibertyTC

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Great to hear the Jeep is happy again with the new Mopar IAC !
Glad I could help, that is what we are here for....Cheers! :)
 

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