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Ls1 won't start

This is a discussion on Ls1 won't start within the General Help forums, part of the LSx Technical Help Section category; I have a 2000 LS1 in my Datsun 240Z I did the conversion about 5 years ago and its been ...

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    1973 240z LS1/t56

    Ls1 won't start

    I have a 2000 LS1 in my Datsun 240Z I did the conversion about 5 years ago and its been pretty much trouble free. About 2 months ago it started dieing on me every once in awhile . But it would always start up after I let it sit. Well it died and now it won't start. It cranks,has fuel pressure and I changed the crank sensor. But it won't fire and suggestion ?
    Thanks in advance

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    Member 00ls-1's Avatar
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    2000 z28

    sometimes there is residual pressure u may need to let all of the pressure off of the fuel rail and see if it will build back up not sayin you havent done it but i had that problem checked pressure and it still wouldnt start after changing the coil pack it still wouldnt start let all the pressure off and it wouldnt build back up so wasted money on the pack

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    '02 WS.6 / '07 Suburban

    Are you running it with a stock computer or aftermarket controller? Can you scan for codes?

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    2002 TRANS AM WS6

    no start

    if your using a ls1 fuse block that's under the hood check the ignition relay. switch it with one of your fan relays and see if it starts. my 02 ls1 would start intermittently. it got worse after a couple weeks and then would not start. i changed the fuel filter and was gonna replace the pump and it was just a 9.00 relay. hope this works.
    thanks,mike

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    1973 240z LS1/t56

    Stock ECM and Datsun fuss box
    Trying to get a scanner
    The pressure builds back
    Last edited by DaEvil; 07-10-2010 at 04:04 PM. Reason: added

  6. #6
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    Do you have a fuel pressure gauge ? Should be about 58 lb...

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    1973 240z LS1/t56

    Yes its about 60 psi

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    Senior Member bills98ta's Avatar
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    1998 Trans Am

    Try re-seating the ecm connectors & check your grounds ?

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    Senior Member bills98ta's Avatar
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    1998 Trans Am

    A scanner might be helpful ...

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    Member 00ls-1's Avatar
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    2000 z28

    if its turning over and sounds like its turning fast you might check the timing chain

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    Member 00ls-1's Avatar
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    2000 z28

    or the harness that plugs into the soil packs? maybe unplugged or something

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    1973 240z LS1/t56

    I got a Snap On scanner and the only code I pull is a P1637
    Generator -L

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    02 35th LE Camaro SS

    This is about the only way I can help with this one. Might help...

    http://www.gearchatter.com/viewpost14190.php

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    1973 240z LS1/t56

    The Generator I am assuming is the Alternator ?

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    Smiles for 9.5 Years cammed goat's Avatar
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    If I recall, yes, "generator" or "GEN" is alternator.

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    1973 240z LS1/t56

    Does anyone Know how to test the CMP and the CKP ?or if there is a link for it
    Thanks

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Go HERE and look at some of the diagnostic charts for CKP and CMP DTC

  18. #18
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    1973 240z LS1/t56

    From what I can figure out is I have no power coming from the PCM going to the CKP .So I'm thinking my PCM is bad ?

  19. #19
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    could be a bad PCM.
    check to make sure the PCM has power and ground. Refer to this schematic
    Click for full size

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