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  1. #1

    Default 1999 Suburban will crank but not start

    We have a 1999 suburban 1500 4x4 with weak spark that is getting fuel but will not start. It cranks and tries but the rotten thing won't start. We have replaced the fuel pump,fuel filter, igniton coil, cam and crank sensors, spark plugs and wires, and it has a new battery. The security light is not coming on and my husband says it acts as if timing is not right. I am at a loss and very frustrated. It was missing and not running right before it quit. Any help is greatly appreciated. Helen

  2. #2


    Welcome to the club. Have you checked your fuel pressure?

  3. #3


    It is sunny and in the 60's today and the stupid truck is running. Could we have a faulty part or water in our gas. We are going to check our fuel pressure. We have a delphi fuel pump in it now. It gets so frustrating. Thanks for your reply, I will post if we figure something definitive out. I wish I could rely on this vehicle, but so far I don't dare. Helen

  4. #4
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    What you said about weak spark kind of piques my curiosity. Was that before you replaced the coil or is it still weak? A weak spark has a lot of trouble fireing off the cat pee that they're selling us for gas these days.
    A weak spark will also have more trouble firing cold fuel than hot fuel too, so if it is still weak this would explain a little of the no start the other day when it was colder.
    How cold was it when it wasn't starting?
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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