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Pulsing/Flatspots only while driving hard, Boostleak or Fuel?

tr7 Jul 29, 2020

  1. tr7

    tr7 Active Member

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    I don't typically drive that hard so often forget all about this

    But my car will drive well and accelerate hard but when pressing on and usually only when up on speed..

    Drops in power for a moment like it's either starving of fuel when hard on it? The car will still happily get up to 100+ speeds if I slowly creep up on it in speed. But if I hard accelerate up the rev range and in speed is when these like pulses/flatspots reveal themselves

    Is this potentially a symptom of a boost leak or a fuel issue?

    Worth noting, my car just before purchasing had the front end up. And I have also replaced the fuel filter with genuine part less than 5,000 miles ago.

    So whats the chances this is just a loose clamp and is there means to log the boost in VCDS to diagnose if it's either Fuel or Boost?

    Thanks
     
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  3. tr7

    tr7 Active Member

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    Front end off*

    For timing belt
     
  4. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

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    Run vcds and see what pings up fault wise, then check requested and actual data for fuel pump etc and boost .
    You may have a failing DV or a small leak with loss of pressure.
    Possibly your HPFP is playing up or your LPFP , whatever the cause, real time data info in vcds will give you a more accurate idea.
     
    Last edited: Jul 29, 2020
  5. tr7

    tr7 Active Member

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    No faults on VCDS (for now anyway) Rob

    FYI, it's 2008 B7 2.0 TDI BRD

    --
    Going to give this a go

    Video says

    Channel 115-3 - requested boost
    Channel 115-4 - actual boost

     
    Last edited: Jul 29, 2020
  6. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

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    Ok chap, i thought you had a TFSI , vcds will still provide you with live data to compare .
     
  7. tr7

    tr7 Active Member

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    Screenshot 2020-07-29 at 22.22.58.png

    Best I could do tonight, limiting driving time and time to spend on graphs.

    One 95mph pass

    Certainly doesn't look right
     

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