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Quick update. Folloing the advice on here (thanks all) I have replaced the EGR bypass and checked its all sound and have replaced the Boost solenoid. But still no difference. I tested the actuator works (this feels like the root of the problem) With the vacuum pipe disconnected, there is no...

great, i'll start working my way through that list. I just "feel" that its something in the air intake, the way its driving and the fact it was ok before i started "fettling" I'll do some checking and dismantling and put the EGR bypass back on and see what happens !

Thats great, its a good point to start. Where is the turbo VNT mechanism? Thanks for all the help

Thanks for the feedback, i'll check the filter at the back left. I think i may have disturbed something, but it could just be a coincidence that its happened then. I've ( hopefully) attached a picture with the sensor i'm referring to highlighted, its in the air intake system, would normally...

Hi All recently picked up a 2005 TD4 to use for the wife's horse trailer and general useful hack. Was running spot on when i got it. Did some investigating and bought an EGR bypass. Fitted it and when i drove the car, had lost lowdown power, didn;t get anything below about 2000 when it...