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Old 11-29-2012, 09:05 AM   #1
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ECU problem? Help!!!

It's a 97 wrangler 2.5 mt.
By cold engine start after few minutes the rpm goes up and down close to engine stop and the air intakes sucks more air and getting loud. When I step on the gas pedal in this condition it sounds like air explosion or sounds like old tractor. After few minutes later when the engine gets warm it goes to normal. Since I disconnect the sensor plug or the ECU connection it is much better now but it still happens sometimes, not so worse though.
Even Chrysler service center couldn't find the problem.
Is this a computer problem? If yes, why do I have still the problem after disconnection? Can I solve this problem with a new ECU? Any suggestion?

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Old 11-29-2012, 12:36 PM   #2
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Check the IAC Valve, you can use throttle body cleaner to clean it off and make sure its not obviously broken. It could be dirty or getting stuck fluctuating the amount of air coming through the throttle body. One of the ideas behind the IAC is to open it up when its cold and restrict it a bit more as it gets warmer.

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Old 12-02-2012, 08:07 PM   #3
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Quote:
Originally Posted by obidya
Check the IAC Valve, you can use throttle body cleaner to clean it off and make sure its not obviously broken. It could be dirty or getting stuck fluctuating the amount of air coming through the throttle body. One of the ideas behind the IAC is to open it up when its cold and restrict it a bit more as it gets warmer.


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Thank you very much! It was very simple and quick work. The result is great, never thought this might be the problem.
Thanks again, you saved my Jeep.
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Old 12-02-2012, 08:45 PM   #4
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WOW you really cleaned that up!
glad that helped, also HEY welcome to wrangler forum.
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