Mack Mp8

Discussion in 'Mack Forum' started by Dadetrucking305, Aug 17, 2018.

  1. ChicagoJohn

    ChicagoJohn Road Train Member

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    Consider your company extremely lucky. Every fleet I know that runs the mp8 has had injector issues at one point or another. I loved my Mack while I had it, but you said it perfectly, they are not fuel efficient trucks. Best I've ever heard with the mdrive was 6.5 running 65.
     
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  3. Arky

    Arky Heavy Load Member

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    We may have more injector problems than I'm aware of. I don't spend a lot of time around the shop. My truck has been very good though.
     
  4. Socal Xpress

    Socal Xpress Road Train Member

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    @ChicagoJohn I am gonna go out on a limb and say they had to redesign the cup/injectors for the common rail system. If it's anything like the DD 15 injectors you wont have to remove the valve cover to replace an injector.
     
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  5. ChicagoJohn

    ChicagoJohn Road Train Member

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    From my understanding the 2018 MP8 was a redesign from previous years. They are now common rail injection with 3 slave injectors. I'm not exactly sure how it works, but my local Mack dealer said it seems to have helped solve the cup issues.
     
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  6. J Rich

    J Rich Medium Load Member

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    May 28, 2018
    Atlanta Ga
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    I had a 15 with 505hp MP8. I took it to Nextran Atlanta and had them put it on the dyno. It put out 300hp to the tires. It should be about 375-400hp. They ended up running a bunch of tests, replacing the EGR, Turbo, and a 6 pack of injectors. Every time they said it was fix, but never was.
     
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