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Problem Idle on a 99K1500 Suburban

Tiny
JOHNMNEIBEL
  • MEMBER
  • 1999 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 184,000 MILES
I have an idle issue with My 99 K1500 Suburban, New fuel filter, new plugs, new wires, Cleaned the Mass O sensor, Looking at the cap and button next but not sure itll fix the issue any ideas
Saturday, July 23rd, 2011 AT 7:14 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks, make sure the EGR is not sticking open 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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Saturday, July 23rd, 2011 AT 10:07 AM

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