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'93 WhiteGMC - Sat for a couple months, now won't start

Discussion in 'Volvo Forum' started by 3ztt, Aug 6, 2011.

Page 2 of 2
  1. Oct 8, 2011 #11
    blanco

    blanco Road Train Member

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    Nov 20, 2009
    Gwinnett County, GA
    0
    Power to ecm?
     
    blanco, Oct 8, 2011
    blanco, Oct 8, 2011
    #11
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  3. Oct 8, 2011 #12
    mgfg

    mgfg Road Train Member

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    Mar 29, 2010
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    On a '93?

    I'm betting the truck is pre-ecm.
     
    mgfg, Oct 8, 2011
    mgfg, Oct 8, 2011
    #12
  4. Oct 10, 2011 #13
    3ztt

    3ztt Bobtail Member

    8
    0
    Aug 6, 2011
    0
    yep, it has an ecm, and it has power
     
    3ztt, Oct 10, 2011
    3ztt, Oct 10, 2011
    #13
  5. Oct 10, 2011 #14
    bender

    bender Road Train Member

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    Jul 20, 2010
    Don't Kid Yourself
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    Since it was starting and running just fine before it sat unused for months, I would consider that the ECM is seeing low voltage during cranking and causing this problem. If the starter is pulling all available voltage during cranking, the ECM will not respond correctly.
     
    bender, Oct 10, 2011
    bender, Oct 10, 2011
    #14
  7. Oct 15, 2011 #15
    jakemcclure

    jakemcclure Bobtail Member

    34
    4
    Sep 23, 2011
    JAMESTOWN,ky
    0
    what engine?
     
    jakemcclure, Oct 15, 2011
    jakemcclure, Oct 15, 2011
    #15
  8. Oct 15, 2011 #16
    3ztt

    3ztt Bobtail Member

    8
    0
    Aug 6, 2011
    0
    It is an N14.

    We charged up the battery and tested voltage to the ECM, but we did not test it during cranking. We're thinking of re-charging it (it's been a while) then having the battery tested. Is it more likely to be a battery failure, or an ECM failure?
     
    3ztt, Oct 15, 2011
    3ztt, Oct 15, 2011
    #16
  9. Oct 15, 2011 #17
    brsims

    brsims Road Train Member

    5,295
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    Aug 8, 2009
    Meadville, PA
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    Crazy thought. Can you pull a couple of batteries from an operational truck, plug them in, and then try it? The current batteries might be old, and drained so low that they just won't hold a charge no matter what you do. Had a similar problem on one of my personal vehicles awhile back, and that's what fixed it.

    If this works, well...it's always the stupid stuff we don't see, right? If it doesn't, well...sorry. It's just an idea from what worked for me in the past.
     
    brsims, Oct 15, 2011
    brsims, Oct 15, 2011
    #17
  10. Oct 15, 2011 #18
    bender

    bender Road Train Member

    2,105
    1,348
    Jul 20, 2010
    Don't Kid Yourself
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    I would refresh the batteries and check all connections including grounds.
     
    bender, Oct 15, 2011
    bender, Oct 15, 2011
    #18
  11. Oct 27, 2011 #19
    3ztt

    3ztt Bobtail Member

    8
    0
    Aug 6, 2011
    0
    Two of the 4 batteries were tested and were pumping strong. Was really hoping that was the problem...
     
    3ztt, Oct 27, 2011
    3ztt, Oct 27, 2011
    #19
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