1989 GMC Sierra 89 chevy TBI

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GPYOUNKER
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  • 1 POST
Engine Performance problem
1989 GMC Sierra V8 Four Wheel Drive Automatic 80;000 miles
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When you first start and run the engine it runs fine for about 10 min.Then it goes haywire dumping to much gas into the TBI There is a loud air sound comming out of TBI exhaust gas burnes your eyes very rich, could it be fuel pressure Regulator Or what els can i check.

Thank you Glen
Jun 11, 2008 at 5:19 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Hi Glen
it is very possible that the fuel pressure is bad and you need to have it checked
I would also recommend checking the EGR valve and its operation
check and or replace MAP sensor and its vacuum line
check for codes if possible

Jun 11, 2008 at 2:16 PM
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