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Keep well serviced, cold or hot engine idles at 1500 to 2000 smetimes stalls when shifting to drive or reverse

Tiny
BIGDADDYJPA
  • MEMBER
  • 1992 GMC SUBURBAN
  • 245,000 MILES
Keep well serviced, has high idle around 1500 to 2000 checked fuses, and vacuum lines, changed o2 sensor. Still idles fast and sometimes stalls when shifting to drive or reverse, do you have any suggestions, thank you for your time
Saturday, September 8th, 2012 AT 12:55 AM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Is the Malfunction Indicator Light illuminated?

The idle control has a fault and most likely the IAC is stuck or there is a vacuum leak after the throttle body.
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Saturday, September 8th, 2012 AT 10:32 AM
Tiny
BIGDADDYJPA
  • MEMBER
  • 2 POSTS
The check engine light came on changed o2 sensor it stayed off. I always keep 1/2 tank of gas and service every 2 to 3 months. Tune up, oil, filters. I will check and replace iac, I have had the burb for 14 years and never serviced the iac.
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Saturday, September 8th, 2012 AT 4:07 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
If you do not have any trouble code, cleaning the IAC might work.
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Saturday, September 8th, 2012 AT 6:21 PM

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