HELP, 2013 maxxforce 9 low power/boost

Discussion in 'International Forum' started by Kmils09, May 14, 2020.

  1. Kmils09

    Kmils09 Bobtail Member

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    Jun 17, 2018
    0
    So during a recent a acquisition I ended up with some real junk trash trucks, go figure. Trying to sort through this mess I have a 2013 international 7400 with a maxxforce 9.

    This truck has not been taken care of very well, but the labrie side loader body on it is in great shape and the truck isnt horrible so I wanna get it running good.

    The truck is just a dog, I know these arent known for their crazy power but this thing is unusable.
    Work ive done as maintenance
    -crank case breather
    -dpf and doc were cleaned
    -egr valve was changed, stuck open
    -boost tubes and solenoid
    -intake manifold pressure and temperature sensors
    The basics, the truck has no boost about 18psi, the exhaust back pressure valve moves with a wrench. The only code is tc1top out of range low I believe.
    One more note is my exhaust back pressure reading is not constant. Sometimes it just comes up with "error"

    Any help is appreciated, not really sure where to go now.
     
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  3. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    That should produce about 34 psi of boost under full load. Exhaust back pressure max is 54 psi. These are known for turbo coking. Cleaning is actually not a bad job. Both turbo compressor housings are removable without taking the turbos off the engine. Coked up oil blowby can be cleaned from the housings and center sections with brake clean. International has a parts kit for this. Another area to cause performance issues is the intake heater grid getting plugged with soot and choking off the intake manifold.
     
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  4. Kmils09

    Kmils09 Bobtail Member

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    Jun 17, 2018
    0

    So, I pulled the intake apart the grid was a little crappy but not plugged by any means. I replaced it anyway, pulled housings off turbos, clean as can be. Is there anywhere else you can point towards? I dont wanna really throw money at this thing not being sure. As you know the international diagnostic software isnt the best lol These things are not my forte. Thank you for the help.
     
  5. Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Disconnect the exhaust before the DOC or somewhere easy, and run it to see if your power comes back.
     
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