# 2002 Buick Century high idle

**URL:** <https://community.cartalk.com/t/2002-buick-century-high-idle/112668>\
**Category:** Maintenance/Repairs\
**Created:** [February 22, 2018, 3:42pm UTC](https://community.cartalk.com/t/2002-buick-century-high-idle/112668 "2018-02-22T15:42:39Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Rod37](https://avatars.discourse-cdn.com/v4/letter/r/ad7895/32.png) [@Rod37](https://community.cartalk.com/u/Rod37)\
**Post date:** [February 22, 2018, 3:42pm UTC](https://community.cartalk.com/t/2002-buick-century-high-idle/112668/1 "2018-02-22T15:42:39Z")

</div>

2002 Buick Century Idles very high and the engine races higher the longer the car runs.

---

<div class="post-metadata">

**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\
**Post date:** [February 23, 2018, 4:44pm UTC](https://community.cartalk.com/t/2002-buick-century-high-idle/112668/2 "2018-02-23T16:44:45Z")

</div>

First…have your codes read. If there is no code then it’s probably a bad TPS. My aunt had this same problem on her Buick and it turned out to have a bad PCM.

---

<div class="post-metadata">

**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [February 23, 2018, 7:37pm UTC](https://community.cartalk.com/t/2002-buick-century-high-idle/112668/3 "2018-02-23T19:37:27Z")

</div>

Locate the Idle Air Control valve on the throttle body.

[https://www.rockauto.com/en/moreinfo.php?pk=46755&cc=1391161&jsn=423](https://www.rockauto.com/en/moreinfo.php?pk=46755&cc=1391161&jsn=423)

While the engine is idling fast, take the handle of a screwdriver and rap on the IAC valve. If the idle speed changes, replace the IAC valve.

Tester