# 2002 Silverado

**URL:** <https://community.cartalk.com/t/2002-silverado/24908>\
**Category:** Maintenance/Repairs\
**Created:** [January 14, 2009, 3:03pm UTC](https://community.cartalk.com/t/2002-silverado/24908 "2009-01-14T15:03:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![matoso](https://avatars.discourse-cdn.com/v4/letter/m/b19c9b/32.png) [@matoso](https://community.cartalk.com/u/matoso)\
**Post date:** [January 14, 2009, 3:03pm UTC](https://community.cartalk.com/t/2002-silverado/24908/1 "2009-01-14T15:03:13Z")

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Engine will not idle when cold, but when warm up it runs fine. Some kind of sensor bad?  
  
  
  
 Thanks  
  
  
  
 Les

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<div class="post-metadata">

**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [January 14, 2009, 3:07pm UTC](https://community.cartalk.com/t/2002-silverado/24908/2 "2009-01-14T15:07:32Z")

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Possibly a sensor, yes. Is the check engine light on? Does the engine start normally, or do you have to do something other than just turning the key to get it running?

I would test the engine temperature sensor first, since the idle is OK when the engine warms up.