adamsewell

Hi Guys,


A4 B7 BUL S LINE 220BHP Standard.


Heres the issue,


pulling up to a junction and the car juddered a sudden lack of power.
Put diagnostics on it and came up with air leak and boost faults, checked all boost pipes they are all fine, checked DV the diaphragm was split so replaced this. still nothing, boost pressure actuator I think? was not giving a 12v feed so I traced wires back to a relay under ECU which when manually operated gave 12v to actuator. Took vehicle for test drive like this but made no difference to power unable to find an accurate wiring diagram to pursue this avenue or maybe barking up the wrong tree? I've removed intake manifold to check gasket for possible air leak took injectors out and not sealing very well so replaced the seals on the nozzle. also took turbo off slight play in shaft and in waste gate shaft don't think enough to cause this problem. it does say the air mass is reading wrong on actual values but surely it should read wrong if there is no boost? could anybody shed any light?


Much appreciated.

Ottoflo

Turbocharger actuator you checked?

adamsewell

yeah checked it when I took the turbo off today