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Thread: 03 chevy truck runs 2 seconds and then dies

  1. #1
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    03 chevy truck runs 2 seconds and then dies

    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. #2
    Senior Member Hayden's Avatar
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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).
    There Is No Replacement For Displacement

  3. #3
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    fuel pressure

    It has 58 lbs. of pressure. it does not lose fuel pressure when it dies
    Last edited by slim; 01-06-2008 at 04:26 PM.

  4. #4
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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. #5
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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.
    <----just your average 5.3

  6. #6
    Senior Member Hayden's Avatar
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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?
    There Is No Replacement For Displacement

  7. #7
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    Yes it starts everytime.

  8. #8
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    mr 75 could probably tell you but he seems to be on vacation, lucky
    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.
    <----just your average 5.3

  9. #9
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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. #10
    Senior Member scottie's Avatar
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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.
    im a straight shooter with upper management written all over me

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