DD15 low NOx conversion efficiency and bad DEF Quality

Discussion in 'Freightliner Forum' started by janboskit, Jun 28, 2016.

  1. janboskit

    janboskit Bobtail Member

    Joined:
    Jun 29, 2010
    Messages:
    12
    Thanks Received:
    3
    Location:
    Chicago
    0
    Hi I'm having some major problems with 2012 Cascadia its been a nightmare truck. It has a low NOx conversion efficiency and bad quality DEF. The NOx outlet sensor have been charged and brand new DEF pump replaced.The dosers cleaned and inspected air supply checked,voltages check all of the wiring inspected. All of the temperatures pressure dosing quantity correct,the whole system removed from the truck and cleaned. Even a DEF tank flushed and refilled. It to the regen starts normally low PPM on the outlet 80% efficiency and then it slowly goes down to 0 and that's it,truck keep regen and it never stops. Any help would be appreciated thanks.
     
  2. ExOTR

    ExOTR Windshield Chipper Extraordinaire

    Joined:
    Jan 23, 2013
    Messages:
    1,706
    Thanks Received:
    1,893
    Location:
    Fort Worth, Tx
    0
    When's the last time you pulled your dpf filters and had them professionally cleaned? If the soot levels get too high and the filters are only flowing at 10% the def system will throw codes also. We normally have to pulse filters about every 200k, 100k for high idle applications.
     
    Intothesunset Thanks this.
  3. janboskit

    janboskit Bobtail Member

    Joined:
    Jun 29, 2010
    Messages:
    12
    Thanks Received:
    3
    Location:
    Chicago
    0
    Filters have been pulled today and cleaned,all of the DOC pressure temperatures etc look normal according to a manual
     
    KB3MMX Thanks this.
  4. iRookie

    iRookie Light Load Member

    Joined:
    Aug 16, 2015
    Messages:
    140
    Thanks Received:
    174
    0
    Buddy of mine was having similar issues with KW and he ended up making it a "GLIDER" in Chicago area....
     
    tax Thanks this.
  5. truckthatpassesyouby

    truckthatpassesyouby Road Train Member

    Joined:
    Jun 3, 2015
    Messages:
    1,876
    Thanks Received:
    6,124
    0
    What do you mean by bad quality DEF?
     
  6. uncleal13

    uncleal13 Road Train Member

    Joined:
    Apr 9, 2009
    Messages:
    3,797
    Thanks Received:
    6,294
    Location:
    Humboldt, Sk
    0
  7. janboskit

    janboskit Bobtail Member

    Joined:
    Jun 29, 2010
    Messages:
    12
    Thanks Received:
    3
    Location:
    Chicago
    0
  8. janboskit

    janboskit Bobtail Member

    Joined:
    Jun 29, 2010
    Messages:
    12
    Thanks Received:
    3
    Location:
    Chicago
    0
    This is a exact name of code,however the DEF tank been removed and cleaned and DEF fluid replaced.
     
  9. Animosus

    Animosus Heavy Load Member

    Joined:
    Dec 7, 2015
    Messages:
    715
    Thanks Received:
    2,807
    Location:
    SE Wyoming
    0
    This is about the point I would email detroit the log file of the regen and they would most likely tell me it needs a DOC/SCR (1-box).
     
  10. SLCTrucker

    SLCTrucker Medium Load Member

    Joined:
    Jan 15, 2009
    Messages:
    404
    Thanks Received:
    199
    Location:
    Salt Lake City UT
    0
    That really sucks when no one can figure out the problems.
    Sounds like its time to clean that engine up & fix it forever.
     
    Intothesunset Thanks this.