# Idle

**URL:** <https://community.cartalk.com/t/idle/28175>\
**Category:** Maintenance/Repairs\
**Created:** [March 23, 2009, 2:56am UTC](https://community.cartalk.com/t/idle/28175 "2009-03-23T02:56:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cj5](https://avatars.discourse-cdn.com/v4/letter/c/cab0a1/32.png) [@cj5](https://community.cartalk.com/u/cj5)\
**Post date:** [March 23, 2009, 2:56am UTC](https://community.cartalk.com/t/idle/28175/1 "2009-03-23T02:56:26Z")

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What can cause idle to rev up n down when car is warm.When car is cold idle is normal.I’ve changed the idle air control vavle and 02 sensors.I have no vaccum leaks.I Notice when the fan comes on idle is normal too.

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [March 23, 2009, 3:33am UTC](https://community.cartalk.com/t/idle/28175/2 "2009-03-23T03:33:33Z")

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A vacuum leak can induce that.