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2000 chevy 1500 5.7 starts sometimes doesnt others.. wait a while then starts?? already done cap rotor tune up.... , crank sensor, fuel pump. doesnt start with starting fluid... but wait a while or overnight and then runs fine all day..

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  • jamesnewton2 Oct 23, 2010

    hi we already did the fuel pump, same problem.. if it was a fuel problem wouldnt it start with starting fluid? could it be the cpu?

  • jamesnewton2 Oct 25, 2010

    wouldnt it run even a little rough if we had a bad injector?? does it have an ignition module?

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Hi, It is most likely either your fuel pump or one of your injectors. Your fuel pump has a check ball in it to hold pressure on the fuel rail. If the check ball quits sealing it lets the pressure bleed off the fuel rail. Same thing if you have an injector stuck open. By turning the key on but waiting to crank it over your letting the fuel rail pressurize again. We just did a 2004 that had the exact same trouble. The pump isn't cheap so you might ask a dealer if there's a way to check to see if it's an injector causing it before you replace the pump. There is a test port on the fuel rail near the throttle body. A mechanic can hook a pressure gauge up and see if that's what's actually happening.

Posted on Oct 23, 2010

  • Tunde Autos
    Tunde Autos Oct 23, 2010

    Check the injector as i have said earlier before proceeding to the CPU...

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