Mitsubishi 3000GT Service Manual page 516

ENGINE AND EMISSION CONTROL
COMPONENT LOCATION
Positive crankcase ventilation valve
Positive crankcase
ventilation valve
Name
CRANKCASE VENTILATION SYSTEM
INSPECTION
(1) After disconnecting the ventilation hose from the positive
crankcase ventilation valve, disconnect the positive crank-
case ventilation valve from the rocker cover, and reconnect
the positive crankcase ventilation valve to the ventilation
hose.
(2) Idle engine, put finger on the opening end of the positive
crankcase ventilation valve, and check that the negative
pressure of the intake manifold is felt with finger.
NOTE
At this time, the plunger in the positive crankcase ventila-
tion valve moves back and forth.
(3) If negative pressure is not felt, clean or replace the positive
crankcase ventilation valve.
POSITIVE CRANKCASE VENTILATION VALVE
(1) Remove the positive crankcase ventilation valve.
(2) Insert a thin stick into the positive crankcase ventilation
valve from the threaded side to check that the plunger
moves.
(3) If the plunger does not move, the positive crankcase
ventilation valve is clogged. Clean it or replace.
Install the positive crankcase ventilation valve and tighten
to specified torque.
Symbol