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1989 GMC Sierra Truck won't idol and engine floods

Tiny
12GRANDS
  • MEMBER
  • 1989 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
The truck will start but idols too high. After it warms up it floods and won't start again unless the gas pedel is to the floor. It quits when you put it in gear to drive. I have replaced the oxygen sensor and the idol air control modular. What do I try next?
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Friday, March 5th, 2010 AT 6:35 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, thanks for the donation. Any trouble codes, you should be able to check codes, yourself. Are the injectors leaking? How long since a tune-up? Use a gage and check fuel pressure. If temp related, sometimes the cts can cause issues. I'm not saying replace anything, I need a direction.
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Monday, March 8th, 2010 AT 11:12 AM

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