# Question on Kia Optima Idle

**URL:** <https://community.cartalk.com/t/question-on-kia-optima-idle/86131>\
**Category:** Maintenance/Repairs\
**Created:** [July 21, 2014, 5:06am UTC](https://community.cartalk.com/t/question-on-kia-optima-idle/86131 "2014-07-21T05:06:00Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![AerioSX](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@AerioSX](https://community.cartalk.com/u/AerioSX)\
**Post date:** [July 21, 2014, 10:23pm UTC](https://community.cartalk.com/t/question-on-kia-optima-idle/86131/21 "2014-07-21T22:23:37Z")

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Driving around, the original very rough idle has come back. I’m starting to think the replacement egr valve is faulty, but it hasn’t thrown a code yet. This is frustrating.

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**Author:** ![AerioSX](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@AerioSX](https://community.cartalk.com/u/AerioSX)\
**Post date:** [July 21, 2014, 11:43pm UTC](https://community.cartalk.com/t/question-on-kia-optima-idle/86131/22 "2014-07-21T23:43:08Z")

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Just bought a new battery at costco, if that doesn’t change I can return it easily.

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**Author:** ![AerioSX](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@AerioSX](https://community.cartalk.com/u/AerioSX)\
**Post date:** [July 22, 2014, 5:39am UTC](https://community.cartalk.com/t/question-on-kia-optima-idle/86131/23 "2014-07-22T05:39:39Z")

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Battery didn’t do anything; I had a friend who works on cars take a look, he told me he had recently worked on a similar car same engine (not same problem though) and that replacing the TPS made the car run much smoother.

Took his advice, went and bought a new TPS, installed it, and the car did run much smoother, but there is still a little surging feel, and a little rpm sway. Much better, but not perfect.

Any other ideas? I might have to replace the injectors is what I’m thinking, or the replacement egr is bad

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**Author:** ![AerioSX](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@AerioSX](https://community.cartalk.com/u/AerioSX)\
**Post date:** [July 28, 2014, 8:15pm UTC](https://community.cartalk.com/t/question-on-kia-optima-idle/86131/24 "2014-07-28T20:15:32Z")

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Any one have any other thoughts on what this could be?

Thanks!

[Previous page](https://community.cartalk.com/t/question-on-kia-optima-idle/86131.md?page=1)