1993 GMC Sierra Idle

1993 GMC SIERRA
165,000 MILES • V8 • 4WD • AUTOMATIC
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WAGNEKA
  • MEMBER
  • 1 POST
when truck is in park truck idles at 1500 rpms sorry I am a lady so do not understand terms but trying. What would cause this - I have had the following work done by a friend: cleaned throttle body with throttle body cleaner, replaced idle air contral valve and that is it but still idles high when in park - please help me can not afford much so any help would be great. I appreciate it.
Feb 23, 2008 at 2:21 PM
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MASTERTECHTIM
  • ✓ASE Certified Mechanic
  • 4,750 POSTS
  • ASE Certified Mechanic
the gasket under the throttle body most likely has a hole in it. try spraying carb cleaner at the base of the throttle body where it bolts to the intake. if it changes the idle then remove the throttle body and replace the gasket. it only costs a couple dollars. while you have the throttle body off clean all the vacuum ports out under neath it.
Feb 23, 2008 at 3:31 PM
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