N14 popping backfire at high RPM

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mad dog logistics llc, Jun 29, 2021.

  1. Mad dog logistics llc

    Mad dog logistics llc Light Load Member

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    Jan 13, 2014
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    Driver says at higher gears 7+ during shift he will hear a pop/backfire. This is every now and then not all the time and coming out exhaust.

    Other issue is its losing power and losing pedal response but for a second then back to normal.

    Truck idles good drives good just messes up when the popping occurs.

    Work thats been done.
    New ECM old one quiet
    New engine wiring harness
    New engine position sensor

    Before emc/harness replacement check fluid light would come on then stop engine then shut done for a second.

    Replacing TPS today to see if that helps pedal/power loss.
     
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  3. Diesel Rehab

    Diesel Rehab Bobtail Member

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    Jul 8, 2021
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    just remember, even if you put something on new, it can still be a bad part. New parts fail all the time (sadly). I would look through insite to see if you have any fault codes before replacing a bunch of parts
     
  4. Nss

    Nss Bobtail Member

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    Jul 5, 2021
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    Can you put a fuel psi gauge and a vacuum gauge on it and drive it.
     
  5. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
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