| Loud knocking noise
Hi all this is my first post but have had loads of help from reading the other posts, just hope you can help me!
Well here goes I have an a140 aventgarde year 2000
and it's due a service now but it has just started to make a realy loud knocking/rattling noise which sounds like it is comming from the drivers side of the engine. The noise is constant but when you rev the engine it sounds ok for a few seconds then carries on rattling, any ideas would be welcome.
Many thanks in advance | 
