Huge Smoke Screen From My Boxster At a Track Day

[Racer Boy]

Today I went to my first track day since I got my Boxster (actually the first time I've been on track in nine years), and things didn't go well. The car seems to handle pretty well, and I'm pleased that after rebuilding the suspension (replacing every part except for rear toe-links) nothing fell off, but in long left-hand turns, the car smoked liked crazy.

The track I went to is The Ridge Motorsports Park in Shelton, Washington, and there are two very long-duration left handers there, so it was a real problem. The smoke was thick enough that the cars behind me were practically coming to a stop because they couldn't see through the cloud.

When I got the car, the AOS had just been changed, along with the intake manifold gaskets. The PO then changed the oil and over-filled it, so when you revved the car past 5,000 rpms it would lay down a thick smokescreen. I drained two quarts of oil out of the car and it has been fine ever since.

Well, fine as in no more smokescreen, but a CEL keeps coming on, then going off after a while. Sometimes the idle is erratic, and it sometimes stalls.

Yesterday I had topped the oil off to the top of the dipstick (after sitting overnight), so I thought maybe somehow the oil level was too high, and maybe it would burn enough off that the problem would go away, but it didn't. In fact, the last lap I did, the oil pressure warning came on in one turn briefly, which meant that the oil was burning off rapidly enough that the level was too low. I decided that was enough, so I packed up and went home.

What do you all think? Probably the AOS? I'm guessing that the diaphragm was damaged by the excess oil when I got the car, after doing a search and reading up on AOS problems. But what about the smoking during left-handers? Could the AOS also cause that?