IRREGULAR IDLE

  • Tiny
  • topper07
  • 2002 GMC Yukon
  • V8
  • 2WD
  • automatic

2002 GMC Yukon, 5.3, When the ambient temperature drops below freezing my idle is very irregular, almost dying, until the motor warms up. When the ambient temperature is higher, the idle is not as irregular. Any suggestions?

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Wednesday, February 23rd, 2011 AT 3:14 AM

4 Replies

  • Tiny
  • PROTECH1980
  • Expert
  • 928 posts

Any diagnostic trouble codes? Noted problems with this engines intake gaskets leaking vaccum causing lean condition/misfire codes. Affected greatly by tempature/ also try cleaning throttle plate with appropriate cleaner and brush to eliminate dirty throttle bore.

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Wednesday, February 23rd, 2011 AT 3:39 AM
  • Tiny
  • topper07
  • Member

Only trouble code was random misfire at one point but I changed plugs and haven't had it since. The service engine soon light would come on but not stay on

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Wednesday, February 23rd, 2011 AT 3:48 AM
  • Tiny
  • PROTECH1980
  • Expert
  • 928 posts

Check the intake gasket for possible vaccum leak.

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Wednesday, February 23rd, 2011 AT 3:51 AM
  • Tiny
  • topper07
  • Member

I may have mispoke previously, initially the vehicle idles high, then when it kicks down, that is the point in which it begins to idle irregularly

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Wednesday, February 23rd, 2011 AT 5:09 AM

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