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Cummins N14 Help

Discussion in 'Trucks [ Eighteen Wheelers ]' started by wish~bone, Jan 20, 2010.

  1. Jan 20, 2010 #1
    wish~bone

    wish~bone Bobtail Member

    24
    14
    Jan 5, 2010
    VA
    0
    I Have a friend with N14 plus rated at 500hp and it get poor fuel miles and don't pull good at all. Although he wish he had a cat like me but I figure I would throw this out here to see if anyone can help with this or what can he do get get more power and fuel miles.Thanks any suggestion :biggrin_2553:
     
    wish~bone, Jan 20, 2010
    wish~bone, Jan 20, 2010
    #1
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  3. Jan 20, 2010 #2
    lowbudget

    lowbudget Medium Load Member

    428
    110
    Apr 12, 2008
    Bismarck, ND
    0
    when was the last overhead run?
     
    lowbudget, Jan 20, 2010
    lowbudget, Jan 20, 2010
    #2
  4. Jan 20, 2010 #3
    wish~bone

    wish~bone Bobtail Member

    24
    14
    Jan 5, 2010
    VA
    0
    I'm Not for sure but I think it was about 4 months ago. To be honest I think it is the way ecm is set up and it is a 10spd automatic. It pulls better with a loaded trailer than a empty.
     
    wish~bone, Jan 20, 2010
    wish~bone, Jan 20, 2010
    #3
  5. Jan 21, 2010 #4
    truckfixinsob

    truckfixinsob Bobtail Member

    8
    1
    Jan 21, 2010
    0
    If the truck has an automatic I would have to say there is a lock up problem with the torque converter, thats why it pulls better loaded than empty. It also explains low fuel mileage an power. The N-14 is a very efficient engine. It should pull rite with a cat and get better fuel mileage doin it.
     
    truckfixinsob, Jan 21, 2010
    truckfixinsob, Jan 21, 2010
    #4
  7. Jan 21, 2010 #5
    Heavyd

    Heavyd Road Train Member

    7,812
    6,265
    Feb 4, 2009
    0
    Well, if it is an N14 it is at least 10 years old, might just be tired!
     
    Heavyd, Jan 21, 2010
    Heavyd, Jan 21, 2010
    #5
  8. May 1, 2010 #6
    williamdecker

    williamdecker Bobtail Member

    30
    3
    May 1, 2010
    St. Louis, MO
    0
    Have you checked the charge-air-cooler? A leaking charged air cooler will cause you to loose fuel economy. Also, if your CAC is leaking and you have a pyrometer, you will see high exhaust temps.
     
    williamdecker, May 1, 2010
    williamdecker, May 1, 2010
    #6
  9. May 1, 2010 #7
    JohnP3

    JohnP3 Road Train Member

    1,594
    684
    Feb 21, 2010
    Rock Creek B.C. Canada
    0
    What he said first, If you have low boost it will cut back on the fuel, Is the throttle pedal going to full travel, then see if it is sucking air in to fuel, what is the fuel pressure, what is the intake fuel restriction, could be a bad filter, collapsed hoses or plugged ECM cooler plate. Check the return fuel they do have a problem with allowing combustion back into the fuel system, Do a cylinder cut out test, you can just unplug them they will not log a code, then if there is a problem injector is it the injector or the pass threw connector. Check the air filter, clean the housing before you put it back in. Inspect the turbo for damage, on the compressor and turbine side. Was the valve set done properly? Just a thought!
     
    JohnP3, May 1, 2010
    JohnP3, May 1, 2010
    #7
  10. May 1, 2010 #8
    blanco

    blanco Road Train Member

    1,221
    296
    Nov 20, 2009
    Gwinnett County, GA
    0
    I think JohnP pretty muched covered everything.. I can't think of anything else..
     
    blanco, May 1, 2010
    blanco, May 1, 2010
    #8
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