Help greatly needed, have a 1.9tdi AVB thats making a weird noise from the turbo. Had a new turbo fitted over a 12 months ago. The car has 190k miles and was running well until this.

The noise is from the turbo and running up the air intake hose from the air filter. Its a thumping sound.

Was told its the EGR valve so changed that and the air flow,air filter all with no restbite. Any help would be appreciated. Took it to an audi supposed '' specialist '' garage in Tintern who decided to change the cat converter with no change in the problem/symptoms and setting me back a further £565.

Also, it has started to run very rough and one of the front discs is showing signs of slight rusting so I'm not sure if this is all inter related due to to one of the pressure valves in the vacuum set up or not?

As mentioned any help would be greatly appreciated.

Paul
Hereford