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MX-13 Boost Issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mid-Island, Jun 18, 2022.

  1. Jun 18, 2022 #1
    Mid-Island

    Mid-Island Bobtail Member

    2
    0
    Jun 18, 2022
    0
    Hoping someone can help.

    I have a 2015 Peterbilt 389 with Paccar mx13 that will not build boost past 19 psi..

    When I start the truck the exhaust is clean....

    When i leave the yard the exhaust stays clean until i hit high gears and the engine is asking for torque.... once that happens the boost gets pinned at 19psi and it starts smoking like crazy.

    Limp back home and no smoke.

    I Opened the turbo and found fins broken so i swapped the turbo and the actuator for a brand new one and took it for a test drive and its doing the exact same thing.

    Any help would be greatly appreciated.
     
    Mid-Island, Jun 18, 2022
    Mid-Island, Jun 18, 2022
    #1
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  3. Jun 18, 2022 #2
    Arctic_fox

    Arctic_fox Experienced mx13 execrator

    3,896
    19,771
    Sep 16, 2016
    0
    Check the EGR valve actuators. They got sticky on mine and wouldnt open all the way and i had to get it cleaned to unbork the problem. Also if the EGR has not been cleaned in a while have it pulled, cleaned and inspected as a whole. Lastly have your system tested for leaks. Sometimes the metal elbows or even hoses wear out and crack.
     
    Arctic_fox, Jun 18, 2022
    Arctic_fox, Jun 18, 2022
    #2
    Mid-Island Thanks this.
  4. Jun 18, 2022 #3
    Mid-Island

    Mid-Island Bobtail Member

    2
    0
    Jun 18, 2022
    0
    New things to try...! I will report back after...
     
    Mid-Island, Jun 18, 2022
    Mid-Island, Jun 18, 2022
    #3
  5. Jun 18, 2022 #4
    Goodysnap

    Goodysnap Road Train Member

    3,696
    8,949
    Jul 12, 2017
    0
    Start with engine management EGR/ cleaning. Boost sensor, before and after bpv pressure sensors are all common to plug with soot.
     
    Goodysnap, Jun 18, 2022
    Goodysnap, Jun 18, 2022
    #4
    spsauerland Thanks this.
  7. Jun 18, 2022 #5
    spsauerland

    spsauerland Road Train Member

    4,296
    10,886
    May 31, 2010
    West Harrison, In
    0
    Sounds deleted??? Those tend to plug the exhaust pressure sensor before turbine tube.
     
    spsauerland, Jun 18, 2022
    spsauerland, Jun 18, 2022
    #5
    Goodysnap Thanks this.
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