2008 Mack CXU613 Smoke while Regen . Injector or Doc?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brandon0928, Aug 18, 2022.

  1. Brandon0928

    Brandon0928 Light Load Member

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    Bought a Mack Truck. When it decides to regen while going down the road it starts puffing out smoke when I’m accelerating (getting up to speed and keeping speed) it goes away when I let Off the throttle. Smoke comes from passenger side where the filter is. This seem like the doc is done for or an injector ?
     
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  3. spsauerland

    spsauerland Road Train Member

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    Sounds like a cracked or leaking exhaust or bellows pipe.
     
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  4. Brandon0928

    Brandon0928 Light Load Member

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    Then wouldn’t it do it the whole time ? Not just while doing a regen ?
     
  5. Dave1837

    Dave1837 Road Train Member

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    Those '08-10 Macks smoke like crazy while doing a regen. No DEF so it just dumps fuel into the exhaust and burns everything out leaving white smoke behind
     
  6. AModelCat

    AModelCat Road Train Member

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    DEF doesn't do anything for regen.
     
  7. spsauerland

    spsauerland Road Train Member

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    During Regen you are adding fuel mist into exhaust, shouldn't during normal operation
     
  8. Brandon0928

    Brandon0928 Light Load Member

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    Is there a way to make it not smoke so bad ? Maybe exhaust does have a leak ? It’s look like a freight train when it’s doing it’s regen. Fellas on the cb tell me my trucks on fire LOL. Although it kinda looks like it!
     
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  9. Brandon0928

    Brandon0928 Light Load Member

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    Truck does not take def
     
  10. Brandon0928

    Brandon0928 Light Load Member

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    It doesn’t do it unless it’s in the process of the regen. Which seems to happen every couple days. But it just looks like a freight train when it starts
     
  11. spsauerland

    spsauerland Road Train Member

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    Is it coming from under cab or out of exhaust outlet?
     
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