Did some research and diagnosed as bad/impaired pcv due to smoke from dipstick at idle. I did a pcv job. New everything except for PTC. I just cleaned that out. I also replaced various deteriorated vacuum lines which was pretty much all of them. I was so stoked to finish and was elated when i had no smoke from dipstick and passed the glove test. I had a rubber glove sucking into the oil fill. 1500 miles later I had a p0440 again. I was so happy at having no check engine light on that I was determined to keep it that way. So i changed the remaining vacuum line at the front of intake manifold that leads to a check valve and the evap purge valve. After checking the purge valve I found it stuck open. I could blow right through it. I read tutorials on how to crack it open and put RTV in there and also read that spraying it liberally with carb/choke cleaner can work. It did. Now I can't blow through it. And checked it with 12v source. To finish the job off I replaced both upper and lower torque mounts. Then I started the car let it warm up and first thing I noticed was boost gauge was reading slightly higher(could be my imagination). Then I noticed the smoke was back after 1500+miles of nothing. No smoke out of dipstick, but fails glove test. It doesn't suck in but doesn't inflate either. I thought maybe it was the new vacuum hose so I pulled it at the check valve and car ran rough from loss of vacuum, until I covered Hose with my finger. All the while performing glove test to look for changes. No change. My next step is pulling the intake to check the pcv hoses/ connections. Is there anything I can do to diagnose/fix oil smoke? Please I beg the volvo gods on this forum for their best.
Ps. Sorry for typos and syntax; Hiding under My desk at work on my iPhone.