Only on start up. Someone suggested to disconnect the battery, reconnect and start the engine without revving it up. From what I've learned here, our boxsters will learn and compensate any problems. When I did this, my idle was all out of sync and my CEL started to flash. I freaked out and shut it off. I reset the car again (battery disconnect) and gave it some gas; this ultimately helped prevent my car from being immobile. After finding my problem, it makes perfect sense. It was like any person trying to inhale while water/mucous trickles down the trachea.
On a day to day basis, the white smoke got worse and worse. It started out intermittently present, but as time progressed, I undoubtly expected overcast of smog upon every startup. The only reason why I let it go for so long was because I accepted the fact that our engines will do this, due to position/design of our engines. However, knowing that I had an idle problem AND progressively worsening white smoke, I dove into fixing it myself. I only spent less than $150 for the parts and about 3-4 hours of my time. Saving a few hundred dollars and having the relief of that nightmare was well worth the time.
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