I posted this in the Ralliart section also but haven't gotten any info, figured I'd try here as well.
I've noticed this problem in the last few days and was hoping someone could help me out. If my car is idling for awhile, like sitting in a parking lot not the short time at a light, the exhaust starts smoking. My rpms seem to fluctuate as well when it starts smoking. Once I start driving everything is fine and no more smoke. I've been checking the oil and I don't see anything in it and it's keeping it's level. The coolant looks fine as well but has gone down a bit. I replaced the pcv valve as I've read that could be the problem but it's still doing it after the replacement. Could it be a bad head gasket even though I'm not getting any contamination in the oil or coolant?

 

what color smoke?


probably turbo seals.

 

It's kind of hard to tell. It's very random when it happens and it's not pouring out smoke, just enough to be able to notice it.

 

I'd also suspect the turbo seals or bad valve seating.