BMW E65 turbo boost pressure loss and lack of power
E65 diesel won't pull and boost pressure is missing - what can cause it?
First check the turbo control rod and the actuator that moves the turbo vanes, as well as the vanes' freedom of movement: carbon-fouled vanes stick. A boost pressure deviation can also be caused by a boost leak, an exhaust leak or a faulty boost pressure sensor.
How can the turbo actuator's operation be checked?
The actuators activate when the car's central locking is locked and unlocked, and a click can be heard from the actuators. If no sound is heard, the actuator is suspect. In live data you can compare requested and actual boost pressure, which makes it easier to narrow down the fault.
The car accelerates jerkily and power cuts out - is the turbo broken?
Not necessarily. A faulty mass air flow sensor, located in the turbo's intake pipe, causes jerky acceleration. If the new part's number is the same as the old one, coding is not needed.
Oil coming from a boost pipe joint - is the turbo broken?
Not on the basis of an oily pipe alone. Boost pipe joints often sweat oil. Oil can also build up because of the crankcase breather, so its condition should be checked before replacing the turbo.