# fluctuating idle

**URL:** https://forums.speedlife.net/t/fluctuating-idle/124074
**Category:** SON240sx Automotive
**Created:** [May 1, 2009, 7:01pm UTC](https://forums.speedlife.net/t/fluctuating-idle/124074 "2009-05-01T19:01:44Z")
**Posts on this page:** 3
**Page:** 2

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### Author: ![KA24Power](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ka24power/32/5595_2.png) [@KA24Power](https://forums.speedlife.net/u/KA24Power)
#### Post date: [May 5, 2009, 6:08pm UTC](https://forums.speedlife.net/t/fluctuating-idle/124074/21 "2009-05-05T18:08:44Z")

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haha, I’ve never heard of a coolant bubble causing idle problems before. Sounds like a faulty TPS. You should check the sensor itself or at least pull some codes from the ECU before putting new parts on.

sent you a PM

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### Author: ![Tacoboy](https://avatars.discourse-cdn.com/v4/letter/t/2acd7d/32.png) [@Tacoboy](https://forums.speedlife.net/u/Tacoboy)
#### Post date: [May 6, 2009, 10:06pm UTC](https://forums.speedlife.net/t/fluctuating-idle/124074/22 "2009-05-06T22:06:49Z")

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On my sr20, a coolant bubble will cause a fluctuating idle. Coolant doesnt reach the IACV and it throws the sensor off. It is like this on alot of other motors as well. I am not sure if the KA24 has a coolant IACV.

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### Author: ![jed240](https://avatars.discourse-cdn.com/v4/letter/j/a4c791/32.png) [@jed240](https://forums.speedlife.net/u/jed240)
#### Post date: [May 6, 2009, 10:21pm UTC](https://forums.speedlife.net/t/fluctuating-idle/124074/23 "2009-05-06T22:21:40Z")

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does the ka24de need an iacv or can the aac compensate for it? i have done away with egr and bpt and am about to do away with the iacv 2.

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