View Single Post
      03-16-2014, 04:35 PM   #11
335DEE's Avatar
Drives: 335d
Join Date: Feb 2009
Location: England

Posts: 734
iTrader: (1)

my 2p';s worth .. as had the same issue on our e39 530d , turns out it was vacuum hose had gone brittle and was leaking air in under full vacuum and thus not pulling the actuator back far enough so the turbo wasn't spooling up to it's proper speed .. hence the woooing / siren noise
335DEE is offline   England
Reply With Quote