Quote:
Originally Posted by jogill
I replaced the solenoid and it did not fix the problem 
The only other thing I can think it could be would be the actual wastegate actuator itself, maybe it's sticking and not releasing when commanded. I don't feel confident in this diagnosis since the exhaust pressure is pushing against it so for it to stick and overcome that pressure would be pretty significant. Although I don't know what else it could be.
On the N54 you can buy replacement actuators however on the N55 it's considered part of the turbo so you can't just buy the actuator, at least I'm not finding it. Anyone replace an actuator on a N55?
Many people seem to replace the vacuum lines however I don't see how that would contribute to overboost since the system requires vacuum to make boost. Although I'll likely just replace the line from the solenoid to the actuator if I'm going to replace the actuator anyway.
Anyone have any ideas? |
I believe the N55 wastegate operates reverse of the N54. It needs vacuum to reduce boost. If there is no vacuum to the actuator, the wastegate is stuck closed.