very carefully
adjust the throttle
oil seporation valve
lcation pcv for BMW 1997 318i
Take to a qualified BMW mechanic.
With your hands
replaced crank case valve location at valve cover
loosin the nut on the in side on the trunk adjust it where you wont it then tighten it back
idle control valve
yes
your car doesnoy have a pcv valve it has a oil seperator which is not serviceable
Under the intake manifold!
in the cilinder head cover.