So my 530d is at a BMW specialists having is boost issues and fault codes sorted.
Have so far done:
NEW Stats (both)
NEW Air Filter
NEW Fuel Filter
Swirl Flap Removal
DPF remove and delete
However, whilst the car now no longer has any fault codes popping up (bar glow plug controller which I can sort out another day) the garage says that the car is overboosting (3.4 bar would you believe). It wasn't previously due to faulty sensors above etc...
They have looked into this without driving it (as 3.4 bar is very dangerous for the engine and it cant give enough fuel for that level anyway) and they seem to have noticed that the electronic turbo actuator is moving the wrong way.
They have used DIS and performed the electronic actuator test and compared the movements of mine to an identical 2004 530d that also has an electronic actuator.
Mine has good and full range of movement, no sticking and no other problems, it just moves the wrong way to the identical 530d they tested (which drives faultlessly, its just in for a service).
So in theory what they think is happening is that the turbo is starting at its maximum possible power position (as opposed to the usual starting position) and then moving to the lower power position as you accelerate (as opposed to increasing power as you accelerate).
Has anyone ever heard of this happening before? If so what the hell is potentially causing this?
Car is running a standard and fully updated ECU map with no modifications (bar the above).
Anyone got any ideas?
Strange one this...