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odd rev at random intervals?
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=88&t=79547		 Page 1 of 1
Author:  Cherokeeshrop91 [ Mon Jul 07, 2014 11:04 am ]
Post subject:  odd rev at random intervals?
hoping someone can point me in the right direction,
i drive an 09 kk sport, with 21k miles on it, and for the last three days at random periods it will rev itself up. the first time it did it it kind of puttered and i thought it was going to die.. i was parked at the time so when the rpms wobbled i got out n looked at my fluids and they are all where they need to be. day before yesterday i was at a stop light and out of nowhere it revved slightly like it was attempting to keep the rpms from dropping and last evening i had parked it and right as i did that, the rpms went from idle to around1.5. i was just hoping someone can tell me if they have had this problem before or if it is just normal. from what i can tell it seems to be getting worse but i'm not sure. all i know is that physically i'm not doing anything to cause the issue that i know of... thanks for the help.
Author:  toy4everyseason [ Tue Jul 08, 2014 7:17 pm ]
Post subject:  Re: odd rev at random intervals?
A/C on or off or does it not matter?
Author:  Gageraid [ Wed Jul 09, 2014 12:36 pm ]
Post subject:  Re: odd rev at random intervals?
toy4everyseason wrote:
A/C on or off or does it not matter?


Good question that needs to be answered.
I remember a few months ago there were at least 2 members having this sort of problem. Can't remember what the fix was. Maybe they'll see this and chime in.
Author:  Cherokeeshrop91 [ Sun Jul 20, 2014 3:08 am ]
Post subject:  Re: odd rev at random intervals?
Update: hey guys, Its still happening... Pulled into the driveway yesterday and had it in park and nothing touching the pedals, it randomly putters like it wants to die and then the rpm's went from 0 to close to 2 like it was attempting to keep itself from dying out. if anyone else has had this problem please chime in. thanks
Author:  Cherokeeshrop91 [ Sun Jul 20, 2014 3:10 am ]
Post subject:  Re: odd rev at random intervals?
and it doesn't seem to matter if the ac is on or off, at least not to me.....
Author:  Gageraid [ Sun Jul 20, 2014 9:00 pm ]
Post subject:  Re: odd rev at random intervals?
Check the spark plugs. Change them cuz you're due anyways.
Not sure what else to suggest. Does it drive okay when you're up to speed?
Author:  lfhoward [ Sun Jul 20, 2014 10:45 pm ]
Post subject:  Re: odd rev at random intervals?
Gageraid wrote:
Check the spark plugs. Change them cuz you're due anyways.

X2. Use copper plugs gapped to the specs in your owners manual. Also may as well change your engine air filter and clean the throttle body while you're at it. Gage has done the throttle body cleaning, as I remember.
Author:  Gageraid [ Mon Jul 21, 2014 8:23 am ]
Post subject:  Re: odd rev at random intervals?
lfhoward wrote:
Gageraid wrote:
Check the spark plugs. Change them cuz you're due anyways.

X2. Use copper plugs gapped to the specs in your owners manual. Also may as well change your engine air filter and clean the throttle body while you're at it. Gage has done the throttle body cleaning, as I remember.


I can't imagine why the engine would do this without a check engine light. If you can duplicate the problem, try to get it on video.
Author:  Scar0 [ Mon Jul 21, 2014 9:09 am ]
Post subject:  Re: odd rev at random intervals?
I had a similar situation right after a dealer service/spark plug change. Took it right back to the dealer. They had a look at it and it turned out to be the throttle body was very dirty inside, causing the butterfly valve in there to stick slightly.
As the RPMs started to drop the PCM would send a signal to open the butterfly a little, but nothing happened, so it would send a signal to open it more. As this happened it would pop open and the RPMs would go way high for a bit.
Anyway, a good throttle body cleaning took care of it.
Author:  Gageraid [ Mon Jul 21, 2014 7:39 pm ]
Post subject:  Re: odd rev at random intervals?
Scar0 wrote:
I had a similar situation right after a dealer service/spark plug change. Took it right back to the dealer. They had a look at it and it turned out to be the throttle body was very dirty inside, causing the butterfly valve in there to stick slightly.
As the RPMs started to drop the PCM would send a signal to open the butterfly a little, but nothing happened, so it would send a signal to open it more. As this happened it would pop open and the RPMs would go way high for a bit.
Anyway, a good throttle body cleaning took care of it.


This would be something very cheap and easy to take a look at if this is your problem.
A can of throttle body cleaner is about $7 or so and a few paper towels.
You can leave the throttle body on or off to clean it, takes about 5 minutes to take it off for a thorough clean.
Author:  Cherokeeshrop91 [ Mon Jul 21, 2014 10:33 pm ]
Post subject:  Re: odd rev at random intervals?
thanks for the help guys, and ya the next time i do an oil change im going to do plugs, and tranny fluid along with the throttle body cleaned. Gage, is there a write up on it, i haven't exactly torn into the engine bay yet?
Author:  Gageraid [ Tue Jul 22, 2014 9:54 am ]
Post subject:  Re: odd rev at random intervals?
You'll need a flat head screwdriver to get the intake tube off. With the tube off you'll have access to the throttle body. If you have the right size socket you can take off the throttle body for a more thorough cleaning which I'd recommend.
Make sure you use throttle body cleaner, you can buy it at any Walmart or car store. Grab a few paper towels, too. Spray liberally and manually work the butter fly with your hand. You want the area around the butterfly to be very clean cuz it gets gummed up with carbon.
Use the paper towels to clean up. The paper towels should be filthy when done.
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