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Cat c15 MBN

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kw Owners Club, Feb 5, 2020.

Page 1 of 2
  1. Feb 5, 2020 #1
    Kw Owners Club

    Kw Owners Club Bobtail Member

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    Jan 1, 2019
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    2003 cat c15 single turbo MBN 475hp in a Peterbilt.new turbo ,flow through mufflers.It smokes black when under load constantly,not just a small puff when upshifting but a steady stream of smoke,also just had a valve set done and air and feul filters so all that is outta the way and made no difference......worn injectors ??
     
    Kw Owners Club, Feb 5, 2020
    Kw Owners Club, Feb 5, 2020
    #1
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  3. Feb 5, 2020 #2
    lester

    lester Midwest's #1 Feed Hauler

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    Major boost leak? How much boost pressure are you building?
     
    lester, Feb 5, 2020
    lester, Feb 5, 2020
    #2
  4. Feb 5, 2020 #3
    Mattmanstroked

    Mattmanstroked Light Load Member

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    Nov 24, 2019
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    Did this start after replacing turbo?
     
    Mattmanstroked, Feb 5, 2020
    Mattmanstroked, Feb 5, 2020
    #3
  5. Feb 5, 2020 #4
    Kw Owners Club

    Kw Owners Club Bobtail Member

    42
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    Jan 1, 2019
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    Boost is great almost 40psi it's actually done it for a long time it's just strange to me that it would smoke constantly,runs perfect otherwise
     
    Kw Owners Club, Feb 5, 2020
    Kw Owners Club, Feb 5, 2020
    #4
  7. Feb 8, 2020 #5
    anthonyar4

    anthonyar4 Medium Load Member

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    Jun 8, 2019
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    Hmm. Only thing I can think is a sensor issue or rebuild time? Possibly a sensor like the air flow is reading incorrect and not throwing a code. I have a MBN and it only smoked on shifts.
     
    anthonyar4, Feb 8, 2020
    anthonyar4, Feb 8, 2020
    #5
    Kw Owners Club Thanks this.
  8. Feb 8, 2020 #6
    anthonyar4

    anthonyar4 Medium Load Member

    431
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    Jun 8, 2019
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    Check your oil. Had a guy on the road I helped out that probably blew his turbo and was sending all his oil right out the exhaust pulled his dipstick and bone dry.
     
    anthonyar4, Feb 8, 2020
    anthonyar4, Feb 8, 2020
    #6
  9. Feb 8, 2020 #7
    anthonyar4

    anthonyar4 Medium Load Member

    431
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    Jun 8, 2019
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    Obv you’re isn’t blown but could be sending your oil out the exhaust. Check exh tips for oil residue. Intake or exhaust valves stuck or out of adjustment or plain jacked up.
     
    anthonyar4, Feb 8, 2020
    anthonyar4, Feb 8, 2020
    #7
  10. Feb 8, 2020 #8
    anthonyar4

    anthonyar4 Medium Load Member

    431
    92
    Jun 8, 2019
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    Rings worn out...
     
    anthonyar4, Feb 8, 2020
    anthonyar4, Feb 8, 2020
    #8
  11. Feb 8, 2020 #9
    Mattmanstroked

    Mattmanstroked Light Load Member

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    277
    Nov 24, 2019
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    I was thinking he was black smoking which is unburnt fuel.

    Is the engine running the factory program or something else?
     
    Mattmanstroked, Feb 8, 2020
    Mattmanstroked, Feb 8, 2020
    #9
  12. Feb 8, 2020 #10
    062

    062 Road Train Member

    5,852
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    Oct 20, 2013
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    I believe there is a boost sensor mod that fools the ecm into over fueling. @Superhauler can probably tell you where and what to look for.
     
    062, Feb 8, 2020
    062, Feb 8, 2020
    #10
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