Another CAT-tastrophe...6nz cutting out after start up

Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Jul 25, 2018.

  1. KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    That whole harness is new. I double checked to be safe and it looks fine.
     
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  3. KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    It's a 70 pin ecm, and it is doing it with a brand new one, no difference at all.
     
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  4. dr1c

    dr1c Light Load Member

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    Apr 10, 2011
    Alberta
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    I have one that had a similar problem
    I don't know the name of the wire but on drivers side it was a thicker wire wit a molded black junction thing...looks like a fuseable link but it's not.i had to wiggle it and it stay running. Had no visible damage either....ill try to get a pic of it and hopefully I can post it.....drove me crazy for quite awhile before I found it
     
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  5. KittyKicker

    KittyKicker Light Load Member

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    Yeah, if you could post a picture of that it would be great!
     
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  6. SAR

    SAR Road Train Member

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  7. KittyKicker

    KittyKicker Light Load Member

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    No, I haven't. However, I was talking to a mechanic at kenworth who looked at it briefly and said he has seen those symptoms before. It was on another CAT where the owner had installed a new compressor. Somehow while installing the compressor the gear lash was thrown off and the cam position sensor was losing it's timing marks. I have not yet had the chance to recheck the gear lash, but it would make sense...
     
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  8. niceguypmp3

    niceguypmp3 Bobtail Member

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    Aug 31, 2009
    Weldon, IA
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    We have a couple of 6nz's and occasionally upon startup then it will start and then within a second or two it will stumble and the rpm's will slow, not quite till it dies and then it will pick back up to normal idle speed. no check engine light or anything. They don't do it at every start, but more than not. I just figured it was normal since it has never gotten worse in the 7 years that we've owned the trucks.
     
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