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Old 05-24-2010, 03:27 PM   #1
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Idle Speed too high

Hi everyone,

Was wondering if anyone else has had this problem. I have a 95 YJ, 2.5L and recently had to replace the entire exhaust system. Instead of the standard manifold, I opted for a nice set of headers. They also replaced the crank shaft position sensor and the O2 sensor.

Ever since I got her back, the idle runs at 2000rpm cold and drops to 1300rpm warm. I thought maybe the idle speed actuator motor was bad so I replaced it and checked all the vacuum lines. Still have the problem.

I tried resetting the ECU by removing power. Also took it out on a short highway trip to see if that would help. No luck there either.

Getting ready to replace the MAP sensor and the water coolant sensor but am shooting in the dark really. The mechanic says the only code that is being thrown is one that says the coolant sensor is reporting a temp that is lower than it should.

Any help, experience or wisdom would greatly be appreciated.

Thanks.

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Old 05-24-2010, 03:48 PM   #2
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If it was all fine before you had your exhaust replaced then I would be hard pressed not to believe that it a vacuum leak somewhere, and its a good chance its at your intake manifold somewhere. That thing has to be seated perfectly when its reinstalled.

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Old 05-24-2010, 04:47 PM   #3
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Thanks greene91. I did a quick inspection of the intake and all looked well but I'll take a closer look again. Do you think the computer have returned a code for that?
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Old 05-24-2010, 05:16 PM   #4
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Try remove power for a longer time
also drive it for longer it takes sometime for your computer
to ajust too changes but not one hwy
but stop and go normal driving
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Old 05-24-2010, 05:55 PM   #5
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Try the carb cleaner spray on the intake(when the engine is cold), if the idle changes you know its the manifold. Make sure connection is good at temp sensor.
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Old 07-18-2010, 07:17 PM   #6
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Thumbs up Idle Problem Resolved

After mucking around a bit with this, Garyk's suggestion helped me solve the problem. Using a little carb spray I was able to find the leak with in the manifold gasket. It was new when they put the headers on so I took it back to the shop and had them install a new one correctly.

Thanks for all the suggestions!

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