Just had the cambelt and waterpump changed on my 2.0 FSi. I have now noticed a single knock when I do the following: 1) if I pull off in first gear reasonably quickly as soon as I am totally off the clutch with a bit of gas I hear a knock 2) changing up to second as soon as I am totally off the clutch with gas I hear a knock 3) reverse reasonably quickly, again when totally off the clutch I hear it. 4) if I drive along in first gear with the clutch fully up and then come off the gas totally so i can feel the car slow/lurch (still with the clutch up) I hear the knock. Knock happens again if I press the gas again, still with clutch up. The knock sounds like it is coming from inside the car, drivers side. But can't be 100% sure that it is. It's not a very loud knock, can only really hear it with windows closed. Thought it could be caused by something moving about that I keep in my car, but the knock doesn't happen when breaking hard or when going over bumps. Also doesn't happen if I rev car in neutral, or in gear with clutch down. I plan to take car back to dealers, but grateful if anyone has any ideas of what it might be. Seems like it's linked to the accelerator/gearbox??, because as above, can also hear it when first gear is fully engaged and I go on/off the gas. I'm no good with engines..... does the cambelt/waterpump have anything to do with accelerator/engine speed, or is there anyway possible that it could cause a knock??? Cheers guys.