O gal atvirkšciai? Dėl sudrebėjimo kažkas subarška sakabėlėje? Reikėtų kažkaip atjungti sankabėlę, kad generatorius neturėtų galimybės apkrauti variklio.

Arba atvirkščiai ... Aišku numetus diržą variantas tikrinimui.

Ką radau ieškodamas info:

I had the exact same problem with my A3 2.0TDI-140 BKD '06. On idle the car sometimes judders and there's squeaking around the v-belt area. It goes away for a minute when put in neutral before it comes back. The Audi dealership in Iceland diagnosed it as a bad alternator clutch pulley. They put in a new one and it seemed to fix the problem.

I also have the flywheel noise(ticking) when the car has been idling for a minute or two, but that's a whole other problem.

Hope this helps.