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These are blow-bys from the TB I think -- I had the same problem. You may just want to clean your TB again, if your recent cleaning job was thorough and complete (TB removed, new gasket put in, etc. maintenance which is called for every 30K miles I believe)this time you could simply remove the black acordeon hose and wipe the inside there and butterfly plate, small miror can help without removing the whole thing this time, if you don't feel like going through that trouble again. You could also gently remove the mesh grid from the AMM and clean it once it is removed, dry it and put it back on, a small ring is all that is holding it in place. You can clean your black acordeon hose and check for vacuum leak while you are at it.
If you really think you have excess crankcase pressure, you could test your breather box since you have already done the rest of you PCV system -- remove small hose that goes from the breather box to the flame arrestor and put in a longer hose instead so that you can blow in it with oil filler cap removed and you should feel your breath coming out at the oil filler cap. If you want to remove it and clean it, check out Mike Ponte's page at
http://www.mikeponte.com/volvo/oiltrap.htm
You can remove the breather box without removing the intake manifold, I simply removed my air control valve and throttle body and had plenty of clearance. You can check in the 200 archive kourt99 's post "Oil Separator / Flame Trap Question dated February 11th of this year for a good description.
I clean my flame arrestor at every oil change.
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'89 244DL M47 159K miles
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