Right, performed a turbocharger change on the 530d, everything came apart and went back together fine, the turbo whistle has gone but it doesn't seem to be making any boost?? There is a plastic accumulator between the actuator and the boost solenoid, and I think I might have connected it the wrong way round? What does this thing do?

 

Probably a 1 way valve.

 

Let's hope it's just that, what would it be needed for?

 

Did you get it sorted then? ?

 

If you don't use them, it causes more strain on the solenoid as it would be under vacuum and boost at different stages. Rather than just boost.

 

Didn't have a chance to look at it, found this,

http://www.bmwland.co.uk/forums/viewtopic.php?p=913665

Think I've plumbed it wrong way round