Power problem, Turbo not working

[fatboyoz]

Originally Posted by pietervz

Please help me. I have a 2003 X5 3.0D and for no reason at all, I have no power on the car. It is as if the turbo is not kicking in. There is no smoke to indicate that the turbo has blow either. I had a similar problem before and they had to replace some sensor.

Pieter,
I had a similar problem with my '05 diesel. Turns out that the dealer had screwed up the fitting of the new air filter, and the filter sealing ring was cutting off the airflow to the engine. The airflow sensor (just upstream of the filter) was thus measuring a reduced airflow signal to the computer and the turbo was not spinning up. I fixed the filter myself and the turbo is back in action.
Apart from the airflow sensor and the computer, I believe the turbo is controlled by a vacuum switch which is located adjacent to the turbo. On my engine, the is a vacuum feed going into the valve, an electrical connection (from computer?) and then a vacuum feed from the valve to the turbo control.
Colin.