2011 Freightliner Cascadia rough idle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Selvinsar, Oct 17, 2018.

  1. Oct 17, 2018 #1
    Selvinsar

    Selvinsar Bobtail Member

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    Oct 17, 2018
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    I was told replacing the Fuel Quantity valve was going to fix my problem son i put a new one and still have this tipical problem on DD15. Any idea what else i need to check ??
     
    Selvinsar, Oct 17, 2018
    Selvinsar, Oct 17, 2018
    #1
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  3. Oct 17, 2018 #2
    77fib77

    77fib77 Road Train Member

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    It could be an injector, bad fuel filters, bad fuel. Filters are cheaper than injectors. Then injector cut off test. How long does it idle ruff, all the time for 10 minutes?? Take oil fill cap off after engine is good and warm , 150'F, a lot of blow by?
     
    77fib77, Oct 17, 2018
    77fib77, Oct 17, 2018
    #2
  4. Oct 17, 2018 #3
    Oldironfan

    Oldironfan Road Train Member

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    Its usually the fuel meter valve
    But check the Delta P sensor ports for soot. And clean them. Video on youtube.
     
    Oldironfan, Oct 17, 2018
    Oldironfan, Oct 17, 2018
    #3
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