Smoke coming from under the cab driver side during regen.

Discussion in 'Ask An Owner Operator' started by kay_ray, Nov 25, 2020.

  1. kay_ray

    kay_ray Light Load Member

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    does anyone have any idea what this might be .it only happens when truck regens. Thanks
     
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  3. Judge

    Judge Road Train Member

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    So smoking during a regenmeans the DOC is not working efficiently. The DOC could be plugged, dirty, or simply worn out and needs replacement. A faulty injector could also be to blame due to improper spray pattern or volume. First step is to remove and clean, (or just replace) the doser injector.
     
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  4. jason6541

    jason6541 Heavy Load Member

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    Was the wind blowing and blowing exhaust smoke back under truck?. assuming you have a weed burner exhaust. If wind not blowing you may have a clamp on exhaust leaking or a hole. But looks like lots of moisture on the undercarriage sure it wasn’t just water vapor
     
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  5. kay_ray

    kay_ray Light Load Member

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    I ll prob replace the doser injector and see if it helps . Thanks
     
  6. kay_ray

    kay_ray Light Load Member

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    No wind but it might be an exaust leak too. I dont think it was moisture. That smoke smelled like burnt def/diesel
     
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  7. jason6541

    jason6541 Heavy Load Member

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    Yep, sounds like a doser issue
     
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  8. Simms

    Simms Bobtail Member

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    My volvo did this at 500k

    It was a blocked/clogged DEF filter

    the exhaust backfilled to the turbo where the turbo and flextube met
     
  9. loudtom

    loudtom Road Train Member

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    Are you sure it was the DEF filter, or did you mean a DPF or DOC? The DEF filter is located on the pump and doesn't affect the exhaust flow, it only filters the fluid.
     
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  10. Simms

    Simms Bobtail Member

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    Yes, my bad. The DPF (big filter in the burner unit)

    It can clog and make the smoke backfill to the turbo if it clogs up enough.

    Thats what happened to mine.
     
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  11. AModelCat

    AModelCat Road Train Member

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    Exhaust leak. Even if the DPF is severely restricted the only way exhaust is getting out of the pipe is if there's a leak. If the DPF is plugged that badly that it'll push that much exhaust out of the tiniest of leaks, you're likely going to feel a huge loss of power.
     
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