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C15 BXS losing turbo boost

Discussion in 'Trucks [ Eighteen Wheelers ]' started by russtrucker, Jul 4, 2019.

  1. Jul 4, 2019 #1
    russtrucker

    russtrucker Road Train Member

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    I'm driving 05 Peterbilt 379exhd that has CAT C15 bxs with a delete wastegate. On a usual basis turbos would boost all the way to 48 psi. Yesturday, I noticed the turbo isnt boosting than it supposed to and climbs up the hill slower, even with an empty trailer. It only boost up to 29 psi around 1200-1600 rpms. 1600 and higher, just spits 35 psi. Could this be a turbo or other air components such as intake, CAC, or exhaust manifold?
     
    russtrucker, Jul 4, 2019
    russtrucker, Jul 4, 2019
    #1
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  3. Jul 4, 2019 #2
    Superhauler

    Superhauler TEACHER OF MEN

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    What do you mean waste gate delete ? One of the turbos failed. Or you just have a boost leak. Turbo boot or cac or clamp.
     
    Superhauler, Jul 4, 2019
    Superhauler, Jul 4, 2019
    #2
    Oxbow, Cam Roberts and stillwurkin Thank this.
  4. Jul 4, 2019 #3
    tnevin225

    tnevin225 Road Train Member

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    More than likely one of your valve actuators is bad, it limits the turbo pressure as a safety feature to keep from doing damage. Those motors have a reputation for actuator problems, sometimes it's just the wiring going to it also.
     
    tnevin225, Jul 4, 2019
    tnevin225, Jul 4, 2019
    #3
    russtrucker Thanks this.
  5. Jul 9, 2019 #4
    russtrucker

    russtrucker Road Train Member

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    Central PA
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    As I gave few more days, turns out cylinder #6 exhaust manifold gasket is leaking.
     
    russtrucker, Jul 9, 2019
    russtrucker, Jul 9, 2019
    #4
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