Jeep wont idle after battery went dead. - Page 3 - JeepForum.com
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post #31 of 35 Old 01-06-2016, 04:28 PM
mr312712
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Originally Posted by WJCO View Post
I too just went through this prior to seeing this forum. Hopefully it will help others. Basically brand new battery was dead due to hood light staying on (light fell off of mounting clip and was stuck on). Used jump box, cranked jeep, started fine, but died. Did this over and over again. Even after keeping foot on the gas for about 30 seconds, same thing. So eventually, I just kept my foot on the gas for about 2 minutes at 2000rpm. After that it idled fine. I went on about a 15 minute test drive and it is fine now.
Weird I had my battery disconnected for 3 days and I never had this problem.


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post #32 of 35 Old 01-06-2016, 05:39 PM
86cj74.2L
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Depending on engine condition the default parameters in the PCM will not be enough to establish a proper idle. So, it must learn what position to put the IAC at to achieve a proper stable idle.

A coworker with a ford truck (4.6L I think) said that it took a good two weeks before his truck stopped stalling at a stop after the battery was disconnected.

It's part of the adaptive parameters it must relearn. To me a good solid engine should fire up and settle into a stable idle with the default PCM parameters. If it must learn how to idle something is not right.
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post #33 of 35 Old 01-30-2016, 08:44 PM
02jeeperx
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2002 TH, 4.0l with a Optima yellow top battery that died today after rocking out the stereo for the afternoon. I turned everything off and let it sit for about 30 min and was able to start it without jumping it, giving it gas or anything. Ran perfect for about 10 miles then started with the stupid dying at idle. I followed the guys advice and unhooked battery for 30 minutes to let computer reset. Fixed for now. I will let you know if it returns. Thank you!
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post #34 of 35 Old 01-30-2016, 08:46 PM
02jeeperx
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Originally Posted by 02jeeperx View Post
2002 TH, 4.0l with a Optima yellow top battery that died today after rocking out the stereo for the afternoon. I turned everything off and let it sit for about 30 min and was able to start it without jumping it, giving it gas or anything. Ran perfect for about 10 miles then started with the stupid dying at idle. I followed the guys advice and unhooked battery for 30 minutes to let computer reset. Fixed for now. I will let you know if it returns. Thank you!

2002 TJ Wrangler X. Sorry for the typo.
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post #35 of 35 Old 08-23-2017, 09:59 PM
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Originally Posted by the88thpianoman View Post
This IS your problem/solution:

When the battery died, your computer reset. When you jumped it, it wouldn't start right away, so you pressed the gas pedal to coax it to start. In doing so, the computer learned the incorrect throttle position for idle. To fix this, disconnect the battery for at least a half hour to reset the computer again. When you start the Jeep back up, turn it to the on position, but not start, to prime the fuel system. After sitting in the on position for three seconds, turn the key over to start and it will fire right up, and DO NOT touch the gas pedal. Let it idle for a few seconds before doing anything, and the computer will learn the correct idle parameters.

This just worked for me: (thanks jeepforum) Battery was dead, didn't start on the first jump so I gave it a little gas on the second and wouldn't idle without giving a little gas. Followed the help above and worked on the first try.
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