Cummins ISM, Massive White Smoke coming from Exhaust Pipe, but no error codes.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by the7local, Jul 14, 2021.

  1. the7local

    the7local Bobtail Member

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    Jul 14, 2021
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    Hi all,

    So I recently started up my truck after having been sitting for a month with a Cummins ISM engine. We had a lot of rain here for the past few weeks and my exhaust pipe is prone to getting some water in there if it hasn't been moved.

    I start up the truck and immediately I see white smoke come out of the exhaust pipe. That's normal and it normally clears up after 2 minutes, but this time it continued to push out heavy white smoke for well over 5 minutes. I got no error codes in the cab so I shut it off. I can see water leaking out of the DPF filter, so is it possible the entire DPF filter is filled with water?

    I checked the oil level and smelled it, it's normal and dosent smell like coolant. I checked the coolant level and it hasn't changed, I also checked the turbo and it seems to be functioning fine. What could it be?
     
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  3. pavrom

    pavrom Road Train Member

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    Injector , head gasket ...
     
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  4. AModelCat

    AModelCat Road Train Member

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  5. the7local

    the7local Bobtail Member

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    Jul 14, 2021
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    Looks like steam, I can see water particles being spit out of the exhaust pipe and water leaking out of the DPF filter. Smoke would be more heavier, this was kind of free and moving around with the wind.
     
  6. Lazer

    Lazer Medium Load Member

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    My gut reaction would be, if what you see dripping is pure clear water, that what it is=rain water. If it was coolant, it would not be clear. Start it, run it till it clears up. If it never clears, then it’s an issue with the DPF system.
     
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  7. flood

    flood Road Train Member

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    Could also be the egr cooler
     
  8. dngrous_dime

    dngrous_dime Road Train Member

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    That's not how you clean a DPF.....
     
  9. Judge

    Judge Road Train Member

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  10. Catmando

    Catmando Medium Load Member

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  11. Judge

    Judge Road Train Member

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    Ding..ding ding...ding ding ding?
     
    Catmando Thanks this.
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