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Black Soot all over on the roof of my truck

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by lonestar244, Oct 18, 2025.

Page 1 of 3
  1. Oct 18, 2025 #1
    lonestar244

    lonestar244 Bobtail Member

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    Jan 29, 2024
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    Hi there, I noticed this black soot all over on the roof of my truck. Its more on the passenger side and way less on the driver side.

    Any help on what might be going on would be greatly appreciated.

    Thank you IMG_9774.jpeg
     
    lonestar244, Oct 18, 2025
    lonestar244, Oct 18, 2025
    #1
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  3. Oct 18, 2025 #2
    Oxbow

    Oxbow Road Train Member

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    Nov 24, 2015
    Idaho
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    What make, year, engine, emissions?
     
    Oxbow, Oct 18, 2025
    Oxbow, Oct 18, 2025
    #2
    Rugerfan and Diesel Dave Thank this.
  4. Oct 18, 2025 #3
    lonestar244

    lonestar244 Bobtail Member

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    Jan 29, 2024
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    Its got cummins isx 15, dpf deleted back in april, but it only started throwing black soot out recently.
     
    Last edited: Oct 18, 2025
    lonestar244, Oct 18, 2025
    lonestar244, Oct 18, 2025
    #3
    Oxbow Thanks this.
  5. Oct 18, 2025 #4
    xsetra

    xsetra Road Train Member

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    From your exhaust.
     
    xsetra, Oct 18, 2025
    xsetra, Oct 18, 2025
    #4
    lonestar244 Thanks this.
  7. Oct 18, 2025 #5
    lonestar244

    lonestar244 Bobtail Member

    29
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    Jan 29, 2024
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    I know that it is coming from the exhaust. But, need guidance on what might be causing it. I am suspecting that there might be an exhaust leak where the joint for the two stacks meet. Thinking of taking that apart.
     
    lonestar244, Oct 18, 2025
    lonestar244, Oct 18, 2025
    #5
  8. Oct 18, 2025 #6
    Oxbow

    Oxbow Road Train Member

    13,497
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    Nov 24, 2015
    Idaho
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    Most any pre-emission/deleted truck will have soot in the exhaust. In my experience what you are seeing is normal, especially if it has been shut off in a rainstorm.
     
    Oxbow, Oct 18, 2025
    Oxbow, Oct 18, 2025
    #6
    W923, Stringb8n, Bean Jr. and 7 others Thank this.
  9. Oct 18, 2025 #7
    lonestar244

    lonestar244 Bobtail Member

    29
    11
    Jan 29, 2024
    0
    I see. it was fine before. only started happening recently. I am not used to seeing this, but hopefully you are right and that it is normal.
     
    lonestar244, Oct 18, 2025
    lonestar244, Oct 18, 2025
    #7
    Oxbow Thanks this.
  10. Oct 18, 2025 #8
    Cdemars316

    Cdemars316 Heavy Load Member

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    Nov 10, 2018
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    You got water in the stacks, and that's the result of start up, happens in mine alot if I don't just let it idle for awhile to heat the water out of the exhaust, this is only after I wash it or if it has driving rain pushing water into the stacks
     
    Cdemars316, Oct 18, 2025
    Cdemars316, Oct 18, 2025
    #8
    W923, Bean Jr., MACK E-6 and 4 others Thank this.
  11. Oct 18, 2025 #9
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Hesperia, Ca.
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    On my former trucks, @Oxbow hit it on the money, when it rained, (I’ve had flat top exhaust tips) I would get that kind of soot.
     
    Diesel Dave, Oct 18, 2025
    Diesel Dave, Oct 18, 2025
    #9
    Bean Jr., Sons Hero, MACK E-6 and 3 others Thank this.
  12. Oct 18, 2025 #10
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    If the DPF was left in place and not removed or modified it is now cracked and leaking.

    My guess would be you just had a software modification of some kind.
     
    Goodysnap, Oct 18, 2025
    Goodysnap, Oct 18, 2025
    #10
    Rideandrepair, Diesel Dave, Oxbow and 1 other person Thank this.
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