Question about GMC Sierra 2500HD

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Hello, My husband ownes two Gmc diesel trucks. One is a 2000 C3500 series 6.1L (I believe) and the other is a 2002 Sierra 2500 HD Duramax. The C series starts up after turning it over, but takes a long time, and then it will die. He was driving it home the other day and it died in the middle of the rode, he barely got it back home. We bought a fuel filter for it and it seemed better, until he came up to a stop and then it died then to. The sierra has had some issues, but we replaced the batteries and the altinator an now the fuel filter as well. And it had its power back after replacing the fuel filter and now the batteries say that they are fully charged, but it will not start up, but it does try to tur over.

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  • evanselus May 04, 2010

    On both trucks? and what is the maf? My husband and Father in law checked the fuses, how cn you tell if the relays are bad though?

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Hi,
It sounds like you have 1 of a few problems happening.
1. The fuel you have in the vehicles is contaminated.
2. You have a fuel pressure problem which is related to the injector pump.
3. Your fuel fuel delivery system sensors are faulty.

If you can give me the model of the engines etc I can give you the process to access the DLC and fault codes also.

But just check the previous 2 first.
You will have to get the injector pump pressure tested at a Diesel Workshop.

Thanks

Jason

Posted on May 05, 2010

  • Jason Maurirere
    Jason Maurirere May 05, 2010

    I think you may have got the MAF wrong it is actually a MAP sensor or Manifold Absolute Pressure sensor which you will need a multimeter and a Mytivac Tester ehich allows you to test the vacum settings of this sensor.



    Yes get the fuel check in both vehicles first, also check and make sure that all the air is out of the fuel supply system from the filter to the pump and then the injector rail.



    This can be done by bleeding the air from the injectors.Just crack 1 at a time an let the vehicle run it will sound like it's missing but thats ok.

    Do this to all the injectors.



  • Jason Maurirere
    Jason Maurirere Jun 05, 2010

    Hi,



    I hope you have come to some conclusion to this problem.



    I don't know why you have been sugested to check the MAF sensor as diesel engined vehicle don't have these.



    Let me know if you require further information



    Jason

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I suggest check your MAF. Also checked some of the wiring, fuses and relays and injectors. If you can unplug the top big harness plug on the drivers side, whats up? And, if unplug the bottom one it kills the truck? With this, you are check the harness.

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Posted on May 04, 2010

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