I have Blow-by and I tried to measure my Crankcase pressure and there was not enough pressure to show up on the Gauge even when I revved the Engine.

The obvious thing is to pull the Vent Tubing and see if there is any restriction and also check the inside the Breather; if there is a Breather.

Was there Oil coming out of the far end of the Vent Tubing?

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84 300D, 82 Volvo 244Gl Diesel