Dead cylinder on 2000 7.3

Discussion in '7.3L Powerstroke Diesels' started by laserjock, May 8, 2018.

  1. laserjock

    laserjock Rebuilding! Supporting Member

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    Asking for a friend.

    2000 F250 PSD 6 speed

    Buddy of mine had a rough trip to the mountains to meet up with us. About half way the truck died. Wouldn’t start. After a tow and a scan, dealer replaced the injector driver module and sent him on his way. Top of the last mountain it comes up lame. Not enough power to pull itself and the trailer behind it. He coasts it to the bottom of the mountain and comes to find us. Long story short it sounds to me like it’s running on 7. Rhythmic puff of white smoke. Will drag itself at an idle but that’s about it. Tonight he got the code pulled and he sent me this.

    IMG_6380.JPG

    We are thinking maybe broken wire or possibly loose connector under the valve cover.

    He fairly recently added a TS programmer, cold air intake and 5” exhaust. I believe that was 600 miles ago.

    Any help is appreciated. I know nothing about these but I’m trying to help him out.

    Thanks!
     
  2. 79jasper

    79jasper Chickenhawk

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    If it was unplugged, you would get it saying "open."
    I would bet uvch or plug.
    Its shutting one bank down.
    Do this. http://www.gbreman.com/articles/?p=242

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  3. IDIoit

    IDIoit MachinistFabricator Supporting Member

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    I like running the pins on the IDM.
    don't have to disturb the covers unless you have to.
    easier to get to with a 4" lift.
    I cant wait till I delete the IDM in mine!

    17435884_1716372005046567_6451452701041316222_o.jpg
     
  4. laserjock

    laserjock Rebuilding! Supporting Member

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    So if I follow that at all, it sounds like something wrong under the valve cover could toast the IDM?? Surely the dealer should have checked that when replacing the IDM right? It seems that a bad wire in the system could hose the new driver. Is that correct?
     
  5. 79jasper

    79jasper Chickenhawk

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    Pfft, do extra work? Why would they?
    It could, but not as common. As I mentioned, it can sense a short and cut power to that side.
    Now that's not to say weird things can't happen.
    But water is the number one killer of IDM'S.

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  6. greenskeeper

    greenskeeper Full Access Member

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    I second the notion of a burnt harness under the valve cover.
     
  7. laserjock

    laserjock Rebuilding! Supporting Member

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    Update. He ran the procedure above and everything checks out just like it should. Beginning to think the autozone IDM is the culprit. Thoughts on how to confirm that short of swapping it? It was an on the road repair or it probably wouldn’t have been an autozone IDM.
     
  8. 79jasper

    79jasper Chickenhawk

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    Next suggestion would be to swap cylinder 4 injector with another. See if problem follows.
    Were the harness checks done cold or hot?

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  9. laserjock

    laserjock Rebuilding! Supporting Member

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    Cold.
     
  10. 79jasper

    79jasper Chickenhawk

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    I think I would try it warm. Like when the issue happens.

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  11. laserjock

    laserjock Rebuilding! Supporting Member

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    He warmed it up tonight. Here are the values he sent me for the IDM test.

    Test cold #2 4 6 8 cylinders 3.2 ohms #1 3 5 7 cylinders 2.9 ohms.
    Test warm #2 .50
    #4 .50
    #6 30.0
    #8 .94
    #1 1.0
    #3 1.0
    #5 1.2
    #7 .50

    He started the truck and it idled okay. He gave it a little fuel and he says it has a little “flutter” at 2k. No lights on at the moment now.

    What do those numbers say to you guys? I’d expect them to be a little different warm but I’d expect them all to change roughly the same amount. Does that make any sense? That said I’ve never laid hands on one of these.
     
  12. 79jasper

    79jasper Chickenhawk

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    I think at this point, I would do the UVCH along with the pigtails.
    I also think I would pull #4 injector and look at the orings.

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  13. clint bartels

    clint bartels Full Access Member

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    I think you mean #6 as 30 is excessive.
     
  14. 79jasper

    79jasper Chickenhawk

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    Uh, no. I meant cylinder #4.

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  15. clint bartels

    clint bartels Full Access Member

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    Ok I guess I need an explanation of why. To me #6 is the odd ball out as cyl 1-5 and 7-8 are all 0.5 to 1.0 ohms. What designates #4 a pull and inspection.
     

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