Why does PCV valve cause the throttle to freeze? What is the principle? Ask the master for advice.

The blockage of PCV valve will lead to the increase of exhaust volume from intake pipe to crankcase breather pipe, and the increase of exhaust volume will lead to the increase of water vapor. In cold weather, it will condense into water, and then freeze in the snorkel and throttle valve, which will seriously affect the exhaust gas in the crankcase, increase the pressure and even lead to the decrease of engine power. The phenomenon that oil overflows from the oil seal, etc.