Chris NottVolks Autos
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  1. #1
    Reverse Gear

    Join Date
    Dec 2012

    16683 under boost help

    Engine is 2.0tdi BKD
    i have the above fault which is showing car is under boosting, I did a log and you can see that the actual boost lags behind the expected boost as revs rise then drops into limp mode
    I have also noticed like a hunting of the revs around 2k I can feel this driving under load and carefully reving up whilst stationary

    I seem to have changed everything without success Any suggestions would be appreciated.

    Turbo has been rebuilt and set up with correct (new) actuator movement and vaccum.
    N75 valve has been exchanged off my other car.
    Egr valve has been removed and cleaned
    I also made a blanking plate with 5mm orifice to try.
    I have changed mass flow meter off other car.
    changed the egr valve/cooler for new on rear of engine
    checked vaccum hoses with a vac pump

    so my thoughts are is there a restriction in the boost side i.e. intercooler maybe I need to remove and clean/ check?
    Perhaps the CAT is blocked?

    Any one have suggestions to try as at a loss at moment

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  3. #2
    max69vk's Avatar
    3rd Gear

    Join Date
    Apr 2012
    Kingston upon Thames

    16683 under boost help

    Check the boost pipe connection especially at the intercooler, the clips are a crap design & prone to working loose & leaking boost.
    TDI PD170 S-Line Sportback... 191.2bhp & 290lb/ft torque @ standard with an iffy turbo! No idea with the new one or Shark Stage 1 remap installed, DPF off Stage 1 ready to go, Suspension & wheels to be fitted!
    Bits for sale...
    Genuine S-line 18" alloys, A3 Sportback rear lights. A3 5dr window switches & mirror switch. , Brand new PD170 engine cover. PM for details.

  4. #3
    Reverse Gear

    Join Date
    Dec 2012
    Yes good point, I had thought to see if I can change the seals to be sure.
    but I think it's something else, wondering if its the throttle body that will be my next change.



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