1992 GMC Sierra Stalls after start

1992 GMC SIERRA
194,000 MILES • V8 • 4WD • AUTOMATIC
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GMCGIRL
  • MEMBER
  • 2 POSTS
I have replaced everything in the distributor,coil,wires, plugs, rotor, rebuilt the throttle body with new injectors, replaced the computers, sensors galore, fuel filter, but it still stalls just as soon as the engine idles down after start. Is there a fuel shut off on this truck or a computer relay that is causing this? If not where do i go from here.
Jan 12, 2008 at 8:03 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Have you check the fuel pressure. Verify the pressure and then test the fuel pump and oil pressure sending unit The FP/OPSU powers the pump when the engine starts.
Jan 12, 2008 at 8:48 PM
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GMCGIRL
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  • 2 POSTS
How do you verify the fuel pressure? I can hear the fuel pump when you turn the key. It was replaced 3 yrs ago could it be bad again? When it happened last time it would not start at all. Everyone has also told me that if it was the fuel pump that i would have no start at all. I replaced the oil pressure sending unit already. Is there a Ignition Relay on the truck? Because every once in awhile when i go to start it and turn the key the lights come on on the dash but the starter don't turn, only the lights on the dash dim. Could this be an ignition problem?
Jan 12, 2008 at 8:59 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Look for the pressure tap-follow the fuel lines to the rail or throttle body it should have one.
Jan 12, 2008 at 9:08 PM
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