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3406E misfire that won't go away, even after overhaul

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JCMtrans, Jun 2, 2019.

Page 6 of 6
  1. Sep 23, 2019 #51
    JCMtrans

    JCMtrans Bobtail Member

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    Dec 29, 2016
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    Double post
     
    JCMtrans, Sep 23, 2019
    JCMtrans, Sep 23, 2019
    #51
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  3. Sep 23, 2019 #51
    JCMtrans

    JCMtrans Bobtail Member

    45
    27
    Dec 29, 2016
    0
    No fuel temp wire or any mods, is that too high on fuel temp? Fuel comes from dual 150-gallon tanks, so one would think it would have ample opportunity to cool down but if there is some sort of restriction on return somewhere I haven’t found yet would that cause a power issue? All fuel lines on the engine, return included, are new from cat.
     
    JCMtrans, Sep 23, 2019
    JCMtrans, Sep 23, 2019
    #51
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  5. Sep 24, 2019 #52
    Troy_

    Troy_ Road Train Member

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    Dec 13, 2017
    Roma, Alberta.
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    when I was chasing the miss on my 6NZ a tech mentioned a possible high fuel temp issue, he told me the engine would derate when fuel temps reached 145F. I watched the fuel temp on my cat computer and it did reach that temp a few times but there was no change in engine performance. the miss would occur at temps lower than the threshold he mentioned so it was ruled out.
     
    Troy_, Sep 24, 2019
    Troy_, Sep 24, 2019
    #52
    Oxbow and swaan Thank this.
  6. Oct 31, 2021 #54
    238mph

    238mph Bobtail Member

    1
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    Oct 31, 2021
    0
    Following this as I have the SAME exact problem... driving me nuts.... tried everything here except changing out the ECU. Now I'm thinking it's an electrical short happening as the engine vibrates... so next I'm tracing all wires and searching for any chaffing..
    Keep posting any news!
     
    238mph, Oct 31, 2021
    238mph, Oct 31, 2021
    #54
  8. Jun 1, 2022 #55
    RWBethune

    RWBethune Bobtail Member

    1
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    Jun 1, 2022
    0
    Was problem ever solved?
     
    RWBethune, Jun 1, 2022
    RWBethune, Jun 1, 2022
    #55
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