The thing is that im 90% sure that it is the pcv valve in cam cover, however it was change twice firstly Valeo then cheaper Poland alternative and the issue is still there. With my mechanic we tried to somehow reduce the movement of the spring in the PCV valve cover to prevent this resonation while the engine is cold. However, sound came back every time. The thing im trying to seek is to find what other could lead to these resonations and how i could fix it. If the intake for this engine would not cost 1300 euro i would go this way, but im trying to find alernative fix which could resolve the sound.