Turbo over boosting!?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by razor1983, Apr 3, 2014.

  1. razor1983

    razor1983 Medium Load Member

    Jan 17, 2011
    Turbo started over boosting, also the actuator is leaking air along the bottom gasket. The check engine light comes on and off if I back off the throttle slightly, or stop so I cant read the code. Can the actuator be replaced or better yet repaird? Or is this a problem with the VPOD, delta p sensor, egr valve? Where to start?

    Since Im far from home I jerry-rigged it by wedging a piece of wood in between the actuator arm and the little bolt on the turbo that limits the arm travel. Boost pressure came back to normal and truck runs better, but now I have a engine light code 128 146 07 egr valve position incorrect.
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  3. Edgar2191

    Edgar2191 Light Load Member

    Apr 9, 2013
    What yeah and what engine is this? Im guessing its a cummins?
  4. Markvfl

    Markvfl Road Train Member

    Nov 29, 2007
    Apopka, FL
    I have the same problem throwing a code when the Jake is used for more than a few seconds. Then code goes off after Jake is not being used. Occasionally I also get a code for crankcase pressure. Engine is ISX CM871. From your description of the sensors it sounds like you have the same.
  5. Heavyd

    Heavyd Road Train Member

    Feb 4, 2009
    Most turbos do allow the repair or replacement of the wastegate actuator. It is a matter of how nicely it will come off. Often the bolts or screws become seized into the turbo housing and the fight begins!
  6. Powder Joints

    Powder Joints Subjective Prognosticator

    Sep 25, 2007
    Rosamond, SoCal
    By the way wood is not a good choice, turbo get hot. Your exhaust can run hot enough to easily ignite the wood. Or take some marshmallows.
  7. me myself and I

    me myself and I Medium Load Member

    Oct 5, 2009
    vernon hills,Il
    Jerry rigging actuator will lead to new turbo in near future (don't ask me how I know it). I understand it can be repaired. But whatever you'll so don't delay, as turbo is much more expensive than actuator.
  8. razor1983

    razor1983 Medium Load Member

    Jan 17, 2011
    I dont which is the lesser of two evils here. Without rigging the actuator turbo boost is double what it should be, same the engine load. Truck has power but it runs like its choking (too much back pressure?), fuel mileage dropped below 5mpg. When I rigged the actuator arm the boost and the engine load came back to normal levels, truck runs smoother and the mpg came up.

    I called a couple of shops in Cinci area where am at right now, one said I have to replace the turbo and the actuator maybe more. The other one said he can replace the actuator but it needs to be recalibrated which is a major job.
  9. JPenn

    JPenn Road Train Member

    Mar 5, 2008
    Southern Tier NY
    Given that you're mentioning a VPOD I presume you have an EGR equipped Series 60 Detroit. What kind of boost pressure are you seeing and at what RPM? Mine goes up to 43-45 psi on a real hard pull (14L 515hp).

    If you're getting honest double boost I'd be surprised your charge air cooler couplings are staying put.
  10. razor1983

    razor1983 Medium Load Member

    Jan 17, 2011
    Hrmm thats interesting I never had boost that high. What turbo do you have?
    Mine ran at around 15-17 psi at crusing speed of 61mph 1400 rpm. On an uphill pull it would go up to 30-35 psi. Now at crusing
    speed of 61mph at 1400 rpm its at around 25-27 psi, on a incline it will go up to 45 psi at 1500 rpm.
    Ive also noticed that the engine load has doubled from what used to be 50-100 to 120-220
  11. GrapeApe

    GrapeApe Road Train Member

    Jan 7, 2013
    Replacing and calibrating the actuator is not a major job, much cheaper than a whole turbo. The VPOD should be checked too in either case. If the VPOD is allowing too much pressure to the actuator, it may be why the actuator failed. It's a job for someone with DDDL software. You have to force the VPOD to a few different % and measure air pressure out to verify that it is in spec. They are regulated to 90 PSI, so setting the VPOD to 50% will give 45 psi out, etc.
    razor1983 Thanks this.
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