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Old 09-27-2010, 04:09 PM   #1
Join Date: Jul 2010
Location: Georgetown, Ontario, Canada
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I'm Ben, I am new to the forum. I bought a '99 TJ at the beginning of the summer, it has run well, hasn't given me any problems. My one issue is that the revs will hang up around a grand or so when idling occasionally and on start up, I just rev it a little and it dies back down to where it should be, around seven or eight hundred rpm.

I was hoping someone would have any ideas to why it is doing this? Is it common problem? Don't know if it matters but it is a '99 2.5L manual trans.

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Old 09-27-2010, 04:25 PM   #2
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Well if you just bought it this summer have you done any tune ups on it such as sparks, distributor cap, etc... cuz that's a cheap and easy place to start.

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Old 09-27-2010, 04:59 PM   #3
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An even cheaper and easier way to start is to clean in and around the throttle body and the parts that attach to it. These spots get gunked up and since those sensors are what controls our idle it can effect it or make it not consistent at times. Get some carb/throttle body cleaner and clean it good. I always completely take it apart if I'm doing this to make sure you get in all the hidden areas. Its an easy 30-45 minute (at the most) job.

Edit: Also, if you search on this forum about this problem you'll find many results. If cleaning the throttle body doesn't work next step is to check all your vacuum lines for leaks.
'98 TJ 2.5L
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Old 09-27-2010, 05:46 PM   #4
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x2 on cleaning the throttle body and IAC.
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Old 09-27-2010, 06:03 PM   #5
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This is frequently the sign of a quirky TPS sensor...costs around $50 at the dealership (maybe a lil more). You can get them cheaper at Autozone and the like but I've found the cheapo ones tend to be very quirky like that.

Also can be the sign of a vacuum leak, but since it goes away after you rev it, I'm leaning towards the TPS sensor...I had the exact same problem a while back. TPS sensor solved it.
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Old 09-27-2010, 09:53 PM   #6
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Thanks a lot guys I'll have to try that, I'll let you know the results when I can get to working on the jeep, won't be able to until thanksgiving though unfortunately, darn college
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Old 09-27-2010, 09:53 PM   #7
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And yeah I'll have to remember about searching for answers

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