bblarue

My 1999 Boster started blowing white smoke when being started but stops when I take off??

Starter986

Welcome to the forum! Are you asking or telling?

Sounds like your AOS may need some attention. Try here: Inspecting the AOS.

Weazer

Agree with comment above, most likely your AOS (Air/Oil Separator) is on the way out. My 1999 Boxster Base exhibited the same symptom, blowing white smoke upon startup or after a spirited drive. Changed the AOS, no more smoke.

Shawn Stanford

FYI: AOS is a fiddly, but manageable DIY. There are some good YouTube videos about it.

Weazer

True, the Boxster AOS replacement is somewhat of a PIA. particularly the hoses/clamps at rear bulkhead, but at least its not as dastardly as the 996.

Bush Pilot

Could someone point me to a good video or DIY thread on replacing the AOS on a 986. Everything I'm seeing on Youtube shows guys breaking stuff and the videos are incomplete. I've got the job started and it's looking like a real PIA. Also, the videos are not consistent on what needs to be moved out ot the way and how to do that without breaking stuff, in order to do this job.

TexSquirrel

Another problem with AOS DIYs is the early M96 AOS is different than later M96/M97 AOS.
In the 996 the change was 2002. (996.1: M96.01-M96.02 to 996.2 M96.03)
I'm not certain when the change happened in the Boxster.
My 2005 Boxster M96.25 had the newer style AOS.(Similar to my 996.2 M96.03)
The AOSes are similar oil & coolant hose-wise, but they attach differently to the block and head.

Bush Pilot

Yeah, the new AOS I received is shaped differently at the top from what I have. I believe that is why Pelican is recommending getting a new, updated hose to go from the top of the AOS to the intake manifold. But not crystal clear. I guess my expectations are too high. Maybe I'll create a YouTube video, once I figure it out.