986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Loud high pitched squeal ONLY on deceleration

k9dbm · 12-18-2014, 10:47 PM

This could be an Air Oil Separator issue, the squeal could be air being drawn past oil filler cap into the engine, I had this noise last week, also had smoke issues which pointed to AOS, had the AOS changed and all is now well

12-18-2014, 10:47 PM	#2
k9dbm Registered User Join Date: Jul 2013 Location: Gloucester Posts: 11	This could be an Air Oil Separator issue, the squeal could be air being drawn past oil filler cap into the engine, I had this noise last week, also had smoke issues which pointed to AOS, had the AOS changed and all is now well