CBV connections all appear solid, so I don't think that's the problem. I'm also not blowing any smoke at all during the condition I describe, which is why I don't think it's a problem related to the turbo's operation.

Very annoying really... except for thr symptoms I describe, there are none of the larger tell tale signs of certain problems. I do blow a little bit of white smoke/vapor at start-up in cold weather, but nothing abnormal and it disappears once the exhaust system heats up.

thanks for the post, any further thoughts appreciated.

-rt