Never heard a tappy K20 and when I had my EP3 I was around a lot of them! Sure its not injectors or something? Was it been modded in the past?
Not that I know of. Spent most of it's time in Ireland so may have been. The tapping only occurs when it's cold, but it does seem to rise to around 2.5k/3krevs then stop. I thought it was normal tbh as from what I read tapping is rather normal.