As the title says, when i blip the throtle on my car i can hear a rattle noise, sounded to me like a loose chain! But as i thought my car didnt have a chain it could be turbo noise! But thismorning reading up on it it has a chain driven oil pump!? Its not coming from any auxilary parts as i had the belt off an it still done it! Also its only just had a new cambelt and waterpump kit! Its a 53 a3 2.0tdi bkd! Just coming upto 100,000 miles! If so what job to change it? Thanks