03 chevy truck runs 2 seconds and then dies

Discussion in 'Chevy Truck Forum' started by slim, Jan 5, 2008.

  1. slim

    slim New Member

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    I have a 2003 chevy silverado 4.3L. It died driving down the road. Now it will start and run for 2 seconds then it dies. I have tried to scan it for codes. But it will not make a connection. I have reset the passlock. and reflashed the comp. The scanner still has no connection.
     
  2. Hayden

    Hayden Senior Member

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    Put a fuel pressure gauge on it and see what the reading is when you turn your key to on.(don't start it).
     
  3. slim

    slim New Member

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    fuel pressure

    It has 58 lbs. of pressure. it does not lose fuel pressure when it dies
     
    Last edited: Jan 6, 2008
  4. stumpuller454

    stumpuller454 Well-Known Member

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    that is way to much fuel pressure! this can cause just as much a problem as not enough pressure! its probly flooding your truck! may need to purchase a new pump! they have an internal regulator, but check for power at the pump, may be getting too much somehow, also check your ground,
     
  5. mudseeker

    mudseeker Senior Member

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    not sure but i think the newer trucks require that much pressure. i think there is a cam sensor or something that deals with the fuel pump once the engine is started. maybe the oil pressure sensor.
     
  6. Hayden

    Hayden Senior Member

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    Yeah I agree with Mud, 58psi is about normal, I can't think of anything that'd shut down that quick to kill your engine. Can you start it right back up after it dies?
     
  7. slim

    slim New Member

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    Yes it starts everytime.
     
  8. mudseeker

    mudseeker Senior Member

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    mr 75 could probably tell you but he seems to be on vacation, lucky:D
    anyways, i'm pretty sure it has something to do with your oil pressure sensor. i think if the newer trucks do not sense oil pressure it cuts power to the pump in an atempt to save the engine.
    might want to give the dealership a ring and try to confirm this idea.
     
  9. red_atv

    red_atv Member

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    i dont know if 03 has a built in security system on it ,but on the 98 if the fuse is either pulled or blown it'll run for a few seconds then die.starts right back up runs for 2-3 secs. and dies again.
     
  10. scottie

    scottie Senior Member

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    i bet it is the crank sensor. the engine turns over and starts running, and the PCM waits 2 seconds to receive the input from the crank sensor. if it doesnt receive the signal, it shuts the fuel pump off after 2 seconds.
     
    mudseeker likes this.

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