Once you install all the new hoses to the proper locations on the catch can and the valve cover and cylinder 1 intake, you need to do something with the old ccv. You have 2 options here. Option 1: remove the entire ccv unit, and the hose that runs down the the bottom of the oil dipstick.

Buildup of sludge and moisture in the engine. Black smoke originating from engine. On the contrary, should the valve be stuck in the open position, or if there is a disconnection or possible rupture of the system hose that produces a vacuum leak, these would be the symptoms: Engine misfiring when idle. Lean air-fuel mixture.

Undo all the hoses, unscrew the bolts and remove the valve. Replacing the crankshaft sensor is a simple job. It is located just underneath the starter, secured with one bolt. Unplug the connector, undo the bolt, and pull out the sensor. This may require some wiggling. Just pull the plugs and crank the engine over to purge the cylinders. Put plugs back in, top off oil and start the engine. If the engine starts, you need to pick the car up and drive it for more than 1 hour on the highway and check the engine temp using the Hidden OBC menu. ^{The air circulating through the PCV system helps to ensure that the fumes are drawn away from the crankcase and burned in the engine for use. The PCV system also creates a slight vacuum while the air is circulating, which helps to relieve any pressure that could build. This negative pressure is also beneficial because it can prevent oil leaks.} There is also a mesh screen inside the valve cover that can clog and/or collapse. BMW does not sell this screen separately and you are suppose to replace the valve cover. However this company sells just the screen. There is a test method described in that link and also a guide on how to replace the screen. iGRFS. 538 639 816 728 206 637 760 649

bmw e46 ccv valve symptoms