Disconnect the vapor hose (A).
Remove the PCV valve (B).
Insert a thin stick (A) into the PCV valve (B) from the threaded side to check for plunger movement.
If the plunger does not move (PCV valve is stuck), clean or replace the valve.
Install in the reverse order of removal.
PCV valve :
1.89-2.84 N.m (0.19-0.29 kgf.m, 1.40-2.09 lb-ft)