1993 Chevy Silverado No fuel at throttle body

Tiny
MTWCBEAR
  • MEMBER
  • 1993 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 177,000 MILES
93 Chev Silverado, 5.7L will not start.
Have no fuel from the injectors. Fuel pump putting out 12-13psi. Checked injectors pulsing OK. Power to relay OK. New throttle position sensor, IAC, fuel pressure regulator.
Have plenty of spark.
Engine will start only with using starting fluid and will run OK for a while then shuts down and will not start again unless we use starting fluid.
can it be inside the throttle body itself. We have checked just about everything electrical and found no problems. Just can't keep fuel running thru injectors.
HELP? Dont have much hair left to pull out!
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Monday, February 15th, 2010 AT 12:56 PM

7 Replies

Tiny
RASMATAZ
  • MEMBER
Dunno if you are having problems with the ignition reference signal -Injectors are pulsing-degut the TBI and investigate
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Monday, February 15th, 2010 AT 1:40 PM
Tiny
MTWCBEAR
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Just replaced throttle body. Still same problem. Engine will only start with starting fluid. It will stay running if you keep engine at around 1200rpm's. Anything less and it dies and will not re-start without the starting fluid.
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Monday, February 15th, 2010 AT 3:05 PM
Tiny
RASMATAZ
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Verify the fuel pressure if its within specs and clean out the idle air control valve and test the TPS and MAP sensors
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Monday, February 15th, 2010 AT 3:15 PM
Tiny
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New IAC and TPS. Fuel pressure within specs. Replaced MAP also. Still no fuel.
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Monday, February 15th, 2010 AT 4:09 PM
Tiny
RASMATAZ
  • MEMBER
Checked injectors pulsing OK-with the correct fuel pressure it should be getting fuel-

Do you hear the fuel pump come on when key at run?
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Monday, February 15th, 2010 AT 4:15 PM
Tiny
MTWCBEAR
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OK. Pulled IAC, again, to check it even though it is new. Replaced IAC, removed EGR and pluged holes with duct tape and if fired and RAN!
Replaced EGR and now no start again. Not sure if EGR would cause problem and did this stupid engine just decide to start this time?
Removed EGR and blocked off ports again and NO FUEL again. This thing has a mind of it's own.
Maybe the ECM?
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Monday, February 15th, 2010 AT 5:06 PM
Tiny
RASMATAZ
  • MEMBER
Double check the wiring connectors on the computer make sure you have good ground if okay could be the PCM failing
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Monday, February 15th, 2010 AT 6:25 PM

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