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2008 2.0 TDI CVT A6 - Hesitation

DCrz38 Sep 12, 2018

  1. DCrz38

    DCrz38 Registered User

    Hi all, I've recently started driving a 2008 2.0 TDI CVT A6.

    There are a few of issues I've come across, the biggest being the hesitation when accelerating.
    It has gotten to the point where it's quite dangerous pulling out of junctions. If I put my foot to the floor, it won't do anything for at least 1.5-2 seconds and then just light up the fronts before the traction control comes on.

    Few thing I've noticed - when the car is cold and I floor it, then suddenly release the accelerator pedal the excess boost is dumped into the atmosphere (typical BOV noise, not flutter). This only happens when the car is cold - perhaps a boost leak or a faulty wastegate actuator?

    Also I've been told that the dual mass flywheel needs replacing, which I can confirm as sometimes when starting the car it feels like there's an earthquake.

    The EGR valve was replaced just under a year ago as it was stuck open and coked everything up (which had to be 'decoked'). I scanned it using Torque and a bluetooth OBD tool about a week ago and it showed a P0402 - EGR system, excessive flow detected.

    In addition to the above issues, when the car is under load (uphill with a lot of weight in the car), rarely it will not accelerate past 40mph or so. Foot to the floor, revs don't climb.

    The gearbox was replaced just over a year ago (at a very high cost), but I believe it hesitated before this was replaced.

    I've also had the coil light flash up a few times and when it does the power drops momentarily before the light goes off again. No idea why this would appear on a diesel?

    I've ordered a VCDS cable to scan it, but before that arrives I was hoping someone might have some insight into what may be the cause? What I think it may be:
    - Faulty dual mass flywheel vibrations causing issues with the CVT
    - EGR coked everything up again and reducing performance
    - Turbo wastegate actuator sticking and not building boost

    Any help would be appreciated, thanks!
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  3. DCrz38

    DCrz38 Registered User

    Sorry I just realised I've posted this in the C5 chassis.. could a mod please move it to C6?

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