Excessive Black Smoke HELP

Discussion in 'Experienced Truckers' Advice' started by 379LNPete, Jun 10, 2021.

  1. 379LNPete

    379LNPete Bobtail Member

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    Jun 10, 2021
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    I have a 2005 T600 Kenworth with a C15 CAT. I recently rebuilt the motor but did not replace injectors or head. All seemed fine. The truck ran fine for a week after the rebuild and then it started black smoking. I put a few gallons of fuel conditioner in the tanks and changed filters. The smoke cleared up. The truck sat and idled overnight and then black smoked excessively on throttle the next day. When I say excessive I mean black soot anything and everything around the truck. When the truck got back to the yard it just black smoked/soot on the ground excessively at idle. Ive done injector cut out test all checked out fine. Truck isn’t throwing any codes. Truck cranks right up no slow start. Fuel pressure is running around 70 on gauge while going down the road. (That seems low to me) I’m at a loss as to what it could be. Turbo has been checked out and is fine. I’m not sure what else to check/try.
    Fuel lines aren’t stopped up. Any ideas would be greatly appreciated!!!! I have a 3406e CAT in my personal truck so not tons of experience with the Acert. I have several friends that have CAT motors and we’re all out of ideas.
     
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  3. Brettj3876

    Brettj3876 Road Train Member

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    Any of the boots around turbo piping/charge air cooler. Are you losing any boost?
     
    slow.rider Thanks this.
  4. snowwy

    snowwy Road Train Member

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    Sounds like turbo even though it checks out.

    Mine wasn't spinning fast enough when I had the same smoke problem. 2005 w900 isx.
     
    slow.rider and Diesel Dave Thank this.
  5. Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    That was my thinking from the beginning but the op said it was checked already.
     
    slow.rider Thanks this.
  6. ClineER

    ClineER Light Load Member

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    Might recheck injector adjustment, if set wrong they can cause excessive black smoke.
    Is there a restrictor gauge or boost gauge to see if turbos are getting enough air?
    If it's an acert make sure an iva isnt hanging open, there maybe be a code in ecm, or when you pull valve cover you can see plunger hanging down and it wont return easy prying it up.
     
  7. drivinhome

    drivinhome Light Load Member

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    Black smoke = fuel. Too much fuel and not enough air. From what you have posted so far I would take a close look at the air filter and all intake system.
     
    Artax Thanks this.
  8. snowwy

    snowwy Road Train Member

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    My money is still on the turbo.
     
  9. okiedokie

    okiedokie Road Train Member

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    Back in the day:rolleyes:
    Black smoke was big power.:D
     
    God prefers Diesels Thanks this.
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