Sorry to bore everyone with another power loss problem but I went down this painful road 6 months ago which resulted in the Turbo being changed to cure the problem. Since then the car (2001 TDI 130bhp) has ran okay apart from recently when it has suffered from a reduction in power. The symptoms of the problem are:

1) In fourth gear it is very hard to pull over 3000rpm and get the car to go above 90mph (in lower gears will go over 3000 rpm).

2)When changing gear there is no boost for a couple of seconds then the turbo ‘kicks in’.

3) When the turbo does ‘kick in’ it is far more noisier than it used to be and sounds like air is leaking from somewhere ?

4) On one occasion the car went into 'limp mode' but this has only happend once in a month.

I’ve taken the undertray & bumper off and followed the 3” pipe from the bottom of the turbo through the intercooler and back again but cannot find any air leaks. The only concern I have is there was a slight trickle of oil at where this pipe comes out the bottom of the turbo and was wondering if it could be the oil seals in the turbo failing causing the Turbo to make the noise ?

Humble appologies again for this post on a 'frequent topic' but I've read all similar posts and still cannot get to the route cause of this problem, any idea's ?

James