My wifes ED30 on tickover has a sound like someone tapping a bell...it seems to be coming from the left hand side of the engine as you look under the bonnet..it seems to be somewhere by the alternator but i cannot be sure..i have never heard another ED30 or GTI on tickover so not sure if normal or not..the car runs like dream...the cambelt, tensioners and water pump were changed 3000 niles ago back in feb by Audi dealearship..any ideas please.