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Engine Stalling

Tiny
JOSHSHOOK
  • MEMBER
  • 2004 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 121,000 MILES
Why does our 2004 GMC Envoy stall when idling with the heat/ac on?
Monday, May 2nd, 2011 AT 2:21 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Monday, May 2nd, 2011 AT 2:49 PM
Tiny
JOSHSHOOK
  • MEMBER
  • 2 POSTS
Thanks for the tip! Where will I find the IAC? How difficult is this to replace?
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Monday, May 2nd, 2011 AT 3:05 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
After further inspection, I see this truck is equipped with "drive by wire" and the idle speed control is built into the throttle body and quite an expensive component. Try the cleaning first.
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Monday, May 2nd, 2011 AT 3:10 PM

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