Intermittent Turbo Boost HEADACHE!!!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Felix773, Apr 16, 2021.

  1. Felix773

    Felix773 Bobtail Member

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    Jan 21, 2017
    Chicago
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    Hey what’s up guys!

    Wanted to get some advice or knowledge regarding a problem I am having with my 06 Freightliner Columbia. I have a 60 series Detroit Engine 14L. I am loosing turbo boost intermittently at times, sometimes for a few hours or a few mins. As soon as I turn off the truck for 5 Mins and re start it. Turbo boost on. As of now I have changed VPOD, VPOD Air Line, VPOD Harness, Turbo Boost Sensor, Turbo with Actuator, CAC & Hoses & Boots. They did an EGR delete on truck before I bought it. Truck was running fine till a few weeks ago, it started derating. This is my second Columbia and always have had similar problems with them I get code SID 147 FMI 2 . Any advise will gladly be appreciated!!!
     
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  3. benjamin260_6

    benjamin260_6 Medium Load Member

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    Aug 8, 2012
    Ontario, Canada
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    How much boost do you normally have and how much do you have when you lose boost?
     
  4. Felix773

    Felix773 Bobtail Member

    45
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    Jan 21, 2017
    Chicago
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    To be honest, I haven't checked with gauge. Seems significantly less boost than I had a few months before. I would say 1/4 less than when it was running good. And then it just all of a sudden completely stops boosting. I am changing Delta Pressure Sensor now. See what it does. My gut feeling is telling me the EGR valve is to blame.
     
  5. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    Don't sound like its deleted right to me
     
  6. Felix773

    Felix773 Bobtail Member

    45
    6
    Jan 21, 2017
    Chicago
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    I have that thought as well, I took off the compression side hose/pipe coming out of turbo. I found small oil leak, would that be a definitive sign of bad Turbo? Not a lot of oil just a bit. Turbo shaft turns smooth and is firm in place. Would excessive crankshaft pressure cause any turbo problems? Also my coolant temp stays around 150ish and 170 with loads. Is this normal for temp to be running this low?
     
    Last edited: Apr 18, 2021
  7. crucar1800

    crucar1800 Light Load Member

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    Sep 21, 2012
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    Felix. I don't know much about your issue, but it seems like you may what to check the air hose going from the VPOD to the turbo AIR PRESSURE actuator. You may want to inspect that area. see this video. i am referring to this section
     
  8. TFord

    TFord Bobtail Member

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    Dec 5, 2021
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    Any luck Felix with finding the issue. I’m having similar issues and haven’t replaced everything you have yet. I was getting intermittent turbo and was able to shut off and keep going but now that isn’t working. And also my stays below 170 as well unless I’m climbing hills for a prolonged time.
     
  9. crucar1800

    crucar1800 Light Load Member

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    Sep 21, 2012
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    I don't know much, but give this a try please take a look at this link:

    DD15 EPA10 Engine Sensor Locations | DD15 Troubleshooting

    Locate sensor number 15. Every Detroit has one. Sensor comes off with a small diameter allen wrench. then, take a clean microfiber towel and gently wipe it clean all around and try NOT to leave finger prints on it. Install it and see if your intermittent turbo continues. please let us know if it worked.
     
  10. TFord

    TFord Bobtail Member

    4
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    Dec 5, 2021
    0
    Thank you I’ll research this
     
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