# Rough idle when warm

**URL:** <https://community.cartalk.com/t/rough-idle-when-warm/14918>\
**Category:** Maintenance/Repairs\
**Created:** [June 6, 2008, 3:43pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918 "2008-06-06T15:43:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Flash987](https://avatars.discourse-cdn.com/v4/letter/f/a8b319/32.png) [@Flash987](https://community.cartalk.com/u/Flash987)\
**Post date:** [June 6, 2008, 3:43pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918/1 "2008-06-06T15:43:06Z")

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I have an 1998 Toyota Avalon with 110,000 on it. The car runs/idles great when first started, but after a few minutes the idle becomes rough and there is a hesitation/chugging when under light acceleration. Heavy acceleration is fine. The car had a full tune-up less than 5K miles ago.

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**Author:** ![andrew\_j](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@andrew\_j](https://community.cartalk.com/u/andrew_j)\
**Post date:** [June 6, 2008, 3:49pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918/2 "2008-06-06T15:49:41Z")

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Let me guess a check engine light on? If so take it to shop or hopefully auto parts store to get it read for free and post back.

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**Author:** ![Flash987](https://avatars.discourse-cdn.com/v4/letter/f/a8b319/32.png) [@Flash987](https://community.cartalk.com/u/Flash987)\
**Post date:** [June 9, 2008, 7:46pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918/3 "2008-06-09T19:46:51Z")

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Yes, the check engine light just came on and I went to an automotive parts store where they used their code reader. The code indicated a problem related to the EGR valve. It was suggested that I remove and clean the EGR valve and see if it fixes the problem, if not replace the valve.

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [June 9, 2008, 8:20pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918/4 "2008-06-09T20:20:31Z")

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That is sound advice. You should also clean out the exhaust gas passages in the manifold while you have the valve out.

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**Author:** ![Flash987](https://avatars.discourse-cdn.com/v4/letter/f/a8b319/32.png) [@Flash987](https://community.cartalk.com/u/Flash987)\
**Post date:** [June 9, 2008, 10:33pm UTC](https://community.cartalk.com/t/rough-idle-when-warm/14918/5 "2008-06-09T22:33:16Z")

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Will do, thanks for the advice. Luckily for me the valve is easy to get at and it should only take a few minutes to remove