ADVICE:

FIRST - lose the ALL CAPS, it is the text equivalent of yelling, and it's hard for these old eyes to read.

Second - The jiggle test works best when the oil filler cap is the metal type. The newer plastic ones lack the weight to give a right reading.

Do this: Engine idling, remove the oil filler cap, then sit it back on but don't tighten. Very gently lift it off, noticing if there is a slight vacuum trying to pull it down onto the camshaft cover. No vacuum? Clogged PCV system, of which the flame trap is but one part.

A common culprit is the smaller hose from the flame trap cup to the intake manifold. The hose is supposed to be of oil-resistant rubber material. However, the Volvo dealer price on one is like 5x or 10x the price for ordinary vacuum hose at AutoZone, so get a new cheap one and replace as necessary.

Next, remove from the intake manifold the brass fitting that the hose fits onto.
Clean it with a 3/32 inch twist drill (hold with pliers and twist, no need for power drill). Cleaning it off the car keeps bits of crud and brass from entering the intake manifold. Re-install and try the test again.

Still no vacuum? Gotta be either the "S" hose or the oil separator box.

It is compression blow-by that creates pressure in the crankcase. Some is normal, a lot indicates problems.


Good Luck,

Bob

:>)