Cat c15 Mxs smokes at startup

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Johndeere8370, Jan 27, 2022.

  1. Johndeere8370

    Johndeere8370 Bobtail Member

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    Jan 9, 2022
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    I have a c15 mxs. It starts and runs fine when cold. But when I shut it off warm and restart it it sometimes acts like the starter stalls for a second and then starts.

    A puff of black smoke comes out the stacks followed by white smoke for 20 seconds and then it clears up.

    It is not making oil or burning coolant or blowing coolant out the overflow. What would cause this?
     
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  3. Don379

    Don379 Heavy Load Member

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    Jan 7, 2021
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    cold weather. ITs an old cat. MY old cat does same thing. I get plumes of white smoke for 30 seconds after start in cold weather. Just run the truck man
     
  4. Johndeere8370

    Johndeere8370 Bobtail Member

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    Jan 9, 2022
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    It does it after it’s been hot though? That’s what I was concerned about. I know it’s normal after a cold start
     
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