N14 missing around 1500-1600 rpm

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mad dog logistics llc, Jun 6, 2023.

  1. Mad dog logistics llc

    Mad dog logistics llc Light Load Member

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    Truck misses around 1500-1600 rpm on the high side when heavy. Once you pass 1600 goes back to normal and can drive at 1600 rpm no problem just gives you trouble when trying to get up to speed.

    No check engine lights or faults. ( have a Motive device which will tell me if theres a fault )
     
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  3. DUNE-T

    DUNE-T Road Train Member

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    Most likely injector
     
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  4. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    I would agree it's likely an injector. I like to run return fuel into a clean 5 gal bucket and look for aeration. I've seen loose injectors cause similiar symptoms.

    Will it miss if you just throttle up under no load?
     
  5. Mad dog logistics llc

    Mad dog logistics llc Light Load Member

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    Jan 13, 2014
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    Only misses when loaded and its worse when heavy if you bobtail its fine. Only between 1500-1600 then goes away.
     
  6. Heavyd

    Heavyd Road Train Member

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    Unplug your injector connectors one by one until the miss doesn't change, then you have found your faulty injector.
     
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