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Old 06-01-2011, 12:26 PM   #1
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High Idle Issue

From time to time when I start my Jeep it'll idle real high. Sometimes even over 2,000 RPM's. When it does this I'll let it sit there because the RPM's will slowly drop back down to around a little over 1,000. And then after driving it around a little when I come to a stop it will idle where it's supposed to. Sometimes when I'm at a stop light with my foot on the brake (it's an auto) it'll lurch on me. Like the RPM's will jump up for a second or two. But it's a 2004, 4.0 automatic. 31s and 3.73s

Thanks in advance

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Old 06-01-2011, 12:37 PM   #2
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Most likely a vaccum leak. Check for loose or cracked hoses.

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Old 06-02-2011, 02:11 PM   #3
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I checked and I couldn't find anything wrong
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Old 06-02-2011, 03:06 PM   #4
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sounds like a computer issue
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Old 06-02-2011, 03:20 PM   #5
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I've seen that when the idle air controller gets carboned up. (IAC) usually we pull 'em, clean 'em with carb cleaner, ensure the plungers inside are free to move and put 'em back on... smooths right out.

Also happens if the air filter is clogged up or wet.

just a couple ideas...
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Old 06-02-2011, 05:36 PM   #6
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high idle almost always means air is getting in from somehere it should not, low idle can be causing by a lot of things like sensors or dirty or clogged intake system.
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Old 06-02-2011, 06:05 PM   #7
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I cleaned the IAC as many say but in the end I bought a new IAC and cleaned the seat well and all is fine now . easy to do . you can try cleaning it ,even if it don't fix it , it will effect it some letting you know you found the problem area .
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Old 06-04-2011, 03:36 PM   #8
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Ok so I cleaned my IAC today and I've only started it once since the cleaning and it was idling just fine so hopefully I fixed the issue
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Old 06-04-2011, 04:21 PM   #9
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Good to hear. And while you got the carb cleaner handy, pop the butterfly open on the throttle body. If you had build up in the IAC, you can also get the same under the butterfly. It will look like a ring around the bore. This can cause the butterfly to hang partially open at times and cause a high idle condition.
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Old 06-04-2011, 06:00 PM   #10
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If your idle problem persists you can check your (TPS) throttle position sensor. When mine was going bad I would have idling at stop lights at around 2200 along with jerking and lagging at takeoff.
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Old 06-05-2011, 12:53 AM   #11
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Sad to say that my luck has ended. It had another high idle start. So I'm gonna just try to clean everything I can and then check that sensor. I just have I've problem...where is it located roughly?
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Old 06-05-2011, 07:03 AM   #12
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The TPS is bolted to the side of the throttle body, connected to the shaft. It reads how far the shaft is rotating. Use an ohm meter on the terminals to read resistance, readings should smoothly increase/decrease as the throttle is opened/closed. If it skips or looses a reading, you have a bad one.
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Old 06-14-2011, 03:41 PM   #13
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I finally had some time to go out and work on my Jeep and try to get it idling right again. So what I did was just completely took off my throttle body and took it all apart and cleaned the crap out of it. I cleaned everything I possibly could and it seems to be doing a lot better. Keeping my fingers crossed that it stays this way. Thanks again Shelby
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Old 06-14-2011, 08:57 PM   #14
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Well my luck is over (once again). I started it up and it jumped back up to around 2500. What should I do now? I've cleaned everything that I can. Should I just read that sensor that measures how far the shaft is open?
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Old 06-14-2011, 11:08 PM   #15
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Quote:
Originally Posted by 2004_Silver_Sport
Well my luck is over (once again). I started it up and it jumped back up to around 2500. What should I do now? I've cleaned everything that I can. Should I just read that sensor that measures how far the shaft is open?
It just sounds like you need a new TPS. Go down to your local napa, o rielys or car quest and get one. Should cost about 35-45 depending on were you go, or if you want a oem one you can go to your local stealership. Its a very self explanatory job that'll take about 10 minutes with the right tools.
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Old 06-15-2011, 10:15 AM   #16
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My bet is still on vacuum leak. 2500 RPM is mostly because of vacuum leak. Double check all the hoses for cracks. Try the propane trick to see if you can isolate the location. Bad TPS will cause rough idle/hesitation while accelerating but not high RPMs like 2500.

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