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Old 06-01-2009, 12:01 PM   #1
Join Date: Jun 2009
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2005 Wrangler lunges while idling

Whenever I slow or stop, my Jeep will suddenly lunge forward as if someone hits the gas. Only does it when I am pulling into a parking spot, slowing for stop sign or idling. Any suggestions?
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Old 06-01-2009, 12:03 PM   #2
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Is your A/C on?

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Old 06-01-2009, 12:06 PM   #3
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It's been on and off. Haven't really paid attention to the air when it happens.
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Old 06-01-2009, 01:56 PM   #4
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scary! Does it over ride the foot pressure you are applying to the brake pedal?? JJ 's question is relevant... also, do you have big changes in idle when you are not in gear and sitting still? Auto or stick tranny?
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Old 06-01-2009, 02:07 PM   #5
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I can be sitting at a stop light, foot on brake, everything fine. Then, suddenly, it revs and jumps forward and then lets up. I guess if my foot wasn't on the brake it would move forward but I'm not going to test that!

One time, it revved several times, almost like a heartbeat.

It's strange.

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Old 06-01-2009, 04:10 PM   #6
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I've seen that twice before. I have no logical information as to why it does it, but I solved both of them.

Simply disconnect the battery overnight - by morning the memory has totally cleared. The computer reverts back to it's default values.
Then the first few minutes of driving it, drive it fast and slow, do not "take it easy on it." The computer has to re-learn everything, so let it experience all kinds of driving conditions.

It takes a long period of disconnect, like overnight, to get "ALL" the old memory gone. It doesn't work to do it for a short time. Force clearing with a scanner doesn't help either. (Yes, I tried both ways.)

My only thought is it must get some kind of interference loaded into the memory, clearing it and starting over worked both times.

It could have been a lightening storm, radio station, or some outside electrical interference caused it. It's also possible a low battery or bad battery cable connection, or something sparking, may have caused the electrical interference.

Let us know.
It's no wonder the country is falling apart - stupidity abounds!
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Old 06-02-2009, 08:38 AM   #7
Join Date: Jun 2009
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Well, I unplugged my power overnight and the problem seems to be gone. no jumps this morning. I've only taken the Jeep out once but so far so good. I'll keep you posted!

Thanks a ton! you saved me time and $$$


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