BMW Repair: e46 2003 318i, crankcase ventilation, crankcase pressure

Question
hello i have  318i i saw when i start the engine in the morning there are white blue smoke,
and when it become at the normal temperature the engine sound become coarse thats when it in idle
but the smoke get less almost there are no smoke, and when give it gas the sound become smooth and great but the sound still without gas when it in idle.

Thank You

Answer
Nizar, I would look into the crankcase ventilation valve/oil vapor seperator. I don't have this engine in the U.S. so I have no idea where it is or what it looks like. It limits the crankcase pressure by regulating into the intake manifold. If it is faulty then raw oil will get into the intake manifold causing blue/white smoke.
-Evan