Detroit Series 60 sounds like a freight train ! PLUS, I'm only getting 7 MPG bobtailing !!

Discussion in 'Freightliner Forum' started by rbrauns, Feb 2, 2020.

  1. rbrauns

    rbrauns Light Load Member

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    Dec 7, 2014
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    When I bought my new to me 2008 Cascadia with a 14L Series 60 Detroit, I noticed how loud it was. Even the Cat C15 I once used for a day was quieter than my Series 60. The engine isn't just load (80 dB on the highway as per the sound meter on my Smartphone), it makes this irregular thumping noise. The closest sound I can describe is the sound of a freight train going up a hill. The engine was just inframed but the injectors, turbo and all of the other accessories aren't new and still have 800,000 miles on them. Any ideas what this could be?

    The other thing bugging me is that the fuel mileage is 6.9 MPG hand calculated, towing a Uhaul trailer and my SUV, maybe 8,500 lbs tops. Now I'm worried that when pulling loads with this truck, my mileage will drop to 6 MPG or less. I won't make any money with this truck.

    What to do?
     
    stillwurkin Thanks this.
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  3. JohnnyC

    JohnnyC Light Load Member

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    I have 1.2 on my 06 and have replaced all injectors at least once, have it checked. I’m sure the harness is shot at the very least.
     
    Mike250rs Thanks this.
  4. mover man

    mover man Road Train Member

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    Check if your manifold leaking? Did an in frame and didnt change injectors? How about the head, was it resurfaced, rebuilt, or replaced?
     
  5. x1Heavy

    x1Heavy Road Train Member

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    No money? Sell it.
     
    mhyn and OldeSkool Thank this.
  6. Hulld

    Hulld Road Train Member

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    What make and model truck is it in?
    Some cabs are a lot louder than others.
     
    OldeSkool Thanks this.
  7. mover man

    mover man Road Train Member

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    What's an pre emission 08 freightshaker with a Detroit ser 60 go for these days?
     
  8. Chubby Fly

    Chubby Fly Medium Load Member

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    come on man. there is so many variables and too many to list to answer that question.
     
    x1Heavy Thanks this.
  9. Rideandrepair

    Rideandrepair Road Train Member

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    Probably injectors making it chug a lug. Maybe cac is leaking,No telling. Check the simple stuff first, fuel supply, lines, filters, Have it plugged in, check injectors.
     
  10. mover man

    mover man Road Train Member

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    I hear ya, and you sir are correct. However when talking price, there is always an avg.
     
    Rideandrepair Thanks this.
  11. little cat 500

    little cat 500 Road Train Member

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    junk injectors or cups
     
    Rideandrepair Thanks this.
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