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  1. #1

    Default starting is rough, have to depress peddle slightly then shudder start

    hey all,

    my 97 yukon 5.7L suddenly starts acting up on start-up. always fired 100% now hit and miss as if throttle position sensor is not there. if i hear the fuel pump fire up then it usually is ok but seems like no idle kickup for start. press peddle slightly and usually with a snort and buck it will come to life. got home and pulled fuel pump relay and it was quite warm. any help would be great, thanks. p.s. when i checked auto parts for relays, surprisingly, they all listed continuous duty as NO. WHAT? a 3 hour drive seems like continuous to me

  2. #2


    Like you, I think a continuous duty relay should be used as the pump relay.........but, that would cost more.

    The intermittent duty cycle relay is cheaper and will normally last until the warranty runs out.

    It's warm, because it was being operated....that means, the relay coil is still good; however, it does not mean the contacts are any good. If the contacts are bad, the pump will not get power.

    Try a new relay (they're not expensive), and if you still have fuel delivery problems, it might be the pump, or perhaps the wiring.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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