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The problem is as follows: when driving in stop and go traffic, at some point I can feel some slight (most passengers are not able to feel them) vibrations in the cabin, accompanied by a "scratchy" feeling in the gas pedal (like scratching something made of metal I believe - the frequency of this is about 1 scratch/second) and a feeling of "something rotating" (I suppose it's synced with the engine's rpm) when I press the clutch pedal. All these symptoms seem to diminish gradually after exiting the stop and go traffic (could also be diminishing because of the start/stop system - they become lower in intensity after the engine gets restarted this way). Stopping the engine for at least an hour seems to completely eliminate these symptoms.

Another possibly useful observation is that going high rpm (like 2500-3500 - when in stop and go traffic) in first or second gear seems to increase the strange feeling in the clutch pedal.

Also, possibly unrelated, when going up a steep hill that has a straight portion in the middle of it, after the front wheels get on the mentioned portion, there starts a more visible vibration in the cabin, which can be mitigated by increasing the engine's rpm (for example, the vibration starts at about 1500 rpm and I accelerate to about 2000 rpm in first gear).

What could be the cause(s) of the specified symptoms? The car I'm talking about is an Audi A3 Limousine from 2015 (2.0 TDI - 150hp; manual transmission - 6 gears; ~160.000 km).

Thank you in advance!

  • 2
    Sounds like a failing clutch throw-out bearing. – SteveRacer Apr 26 at 2:54
  • That sounds like an answer to me @SteveRacer – GdD Apr 26 at 7:27
  • @SteveRacer does a throw-out bearing failure explain the feeling in the gas pedal and the vibrations when going uphill? Also, does it explain the intermittent nature of the symptoms? By the way, the mentioned vibrations in the cabin happen not only during gear shift, but also with the clutch pedal not pressed at all. – Răzvan-Andrei Ciocoiu Apr 26 at 10:26
  • Possibly a broken pressure plate finger, bad clutch disc, or even a warped flywheel. Temperature may be contributing to the intermittent symptoms. I would try and find any opening, cover, or hole in the bell housing to attempt to do some visual inspection. – SteveRacer May 3 at 2:45

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