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1989 GMC C1500 Idle soars after engine warms

Tiny
PPYRZ
  • MEMBER
  • 1989 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
My 89 Suburban 350 engine starts fine then after a few mins idling the engine idle picks up and then dies like it flooded/ran too rich. Cant start and run it again till it cools. Changed O2 sensor, air/fuel fliters, plugs etc. Is there a sensor switch that is messing up engine vaccum?
Vehicle is locked in a valley by a rockslide so I cant get it to a shop. Thanks!
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Wednesday, October 15th, 2008 AT 6:43 AM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Take a good look at the injectors in TBI they maybe bleeding over the IAC will try to handle more fuel but will die soon ie. Flooded. Won't restart till fuel evaps.
If you have a timming light hook up shine at injectors pattern should by 360 degree even spray if you see dribbling then inj are problem. Also check EGR it maybe opening at idle when engine heats up.
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Wednesday, October 15th, 2008 AT 7:56 AM

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