Fluctuating idle and wont go above 2nd gear - Jeep Wrangler Forum
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Old 11-23-2009, 01:42 PM   #1
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Fluctuating idle and wont go above 2nd gear

On top of the multi function switch having issues the sis in law's TJ has sprung something new on us. Unfortunately I haven't had a chance to experience the issues so everything is based on what she has told me.

She says that it feels like it's about to run out of gas although it has a half tank and when stopped the idle is around 1K rpm's and jumps to 2K and won't go past 45mph or 2nd gear. Of course there is no CEL because that would make things too easy to diagnose. Any ideas?

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Old 11-23-2009, 01:57 PM   #2
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TPS (Throttle Position Sensor) maybe? Listen/look for vacuum leaks... That's about all I can think of right now

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Old 11-23-2009, 02:24 PM   #3
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Thanks for the tip. It's a start.

Also forgot to mention it's a automatic 2002 4.0
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Old 11-23-2009, 02:35 PM   #4
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clogged cat ?
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Old 11-23-2009, 08:44 PM   #5
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2nd on the vacuum leak!
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Old 11-23-2009, 08:44 PM   #6
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mine has a similar problem, it will go into 2nd gear but then won't shift back into 1st and not go to 3rd its an 01

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