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2011 Mack MP7 Rough idle, low power

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by springerj, Dec 30, 2021.

  1. Dec 30, 2021 #1
    springerj

    springerj Bobtail Member

    10
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    May 13, 2014
    0
    I’ve got a 2011 Mack with an MP7 in the shop with a rough idle, jumping between 600 and 650 RPM and low power. Truck has no fault codes. It’s gotten a new EGR pressure sensor, EGR valve, Fuel pressure relief valve, fuel filters. EGR cooler was clean when checked. Removed and checked for debris in fuel lines going to ECM cooling plate. Fuel pressure jumps around between 50 and 60 PSI at idle.

    Any ideas?
     
    springerj, Dec 30, 2021
    springerj, Dec 30, 2021
    #1
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  3. Dec 30, 2021 #2
    cke

    cke Road Train Member

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    cke, Dec 30, 2021
    cke, Dec 30, 2021
    #2
    Brettj3876 Thanks this.
  4. Dec 30, 2021 #3
    Brettj3876

    Brettj3876 Road Train Member

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    Land of local
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    No clue. That one's the Volvo D11 engine.

    @springerj go over to big Mack trucks forum they'll be able to help. A few Mack techs are regulars over there
     
    Brettj3876, Dec 30, 2021
    Brettj3876, Dec 30, 2021
    #3
    springerj Thanks this.
  5. Dec 30, 2021 #4
    springerj

    springerj Bobtail Member

    10
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    May 13, 2014
    0
    Will do, thanks.
     
    springerj, Dec 30, 2021
    springerj, Dec 30, 2021
    #4
    Brettj3876 Thanks this.
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