# idle jumping up and down.

**URL:** <https://forums.speedlife.net/t/idle-jumping-up-and-down/124903>\
**Category:** SON240sx Automotive\
**Created:** [May 29, 2009, 11:39am UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903 "2009-05-29T11:39:38Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Nate\_Drake](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nate_drake/32/5704_2.png) [@Nate\_Drake](https://forums.speedlife.net/u/Nate_Drake)\
**Post date:** [May 29, 2009, 11:39am UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/1 "2009-05-29T11:39:38Z")

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hey guys

have an issue… my sr when left in idle for a minute starts to jump up and back down over and over again… goes from 700 up to 1500 + and back down again…

would this be a vacume leak or something else…

any help is appreaciated

thanks

nate

edit i also just changed my rad, could air in the system be causing this problem?? i have run the engine with rad cap off and reved it, saw bubbles coming out. kept doing that till the air bublles stopped maybe air is still in there??

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**Author:** ![89\_coupe](https://avatars.discourse-cdn.com/v4/letter/8/e0b2c6/32.png) [@89\_coupe](https://forums.speedlife.net/u/89_coupe)\
**Post date:** [May 29, 2009, 12:30pm UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/2 "2009-05-29T12:30:24Z")

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i dont think an air bubble is your problem. check for any vaccum or intake leaks. to do that start the car and run a propane torch around your vaccum lines and intake. if your idle goes up. theres your problem. also check your TPS and IACV

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**Author:** ![Nate\_Drake](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nate_drake/32/5704_2.png) [@Nate\_Drake](https://forums.speedlife.net/u/Nate_Drake)\
**Post date:** [May 29, 2009, 3:17pm UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/3 "2009-05-29T15:17:53Z")

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fixed!!!

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**Author:** ![240xcsv](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240xcsv](https://forums.speedlife.net/u/240xcsv)\
**Post date:** [May 29, 2009, 3:18pm UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/4 "2009-05-29T15:18:58Z")

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So what did you do to fix it 🙂 What was the problem?

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**Author:** ![Nate\_Drake](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nate_drake/32/5704_2.png) [@Nate\_Drake](https://forums.speedlife.net/u/Nate_Drake)\
**Post date:** [May 29, 2009, 3:21pm UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/5 "2009-05-29T15:21:36Z")

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i unno reallly. bled the rad, and re did some vacume lines. was too lazy to try and search for a leak so i changed out some of the vac lines in engine compartment started it up and all good.

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**Author:** ![Sato\_Tatsuya](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Sato\_Tatsuya](https://forums.speedlife.net/u/Sato_Tatsuya)\
**Post date:** [May 29, 2009, 8:56pm UTC](https://forums.speedlife.net/t/idle-jumping-up-and-down/124903/6 "2009-05-29T20:56:30Z")

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I have this same issue with my KA-E…except majority of the times it will just die and I’ll have to restart the engine…even when I am driving and I’m at a stop sign or at a stop light…or if I am just slowing down. What is wrong?