3000GT V6-3.0L SOHC (1998)
Positive Crankcase Ventilation: Testing and Inspection
Crankcase Ventilation System Check
(1) Remove the ventilation hose from the rocker cover.
(2) With the engine idling, put finger on the open end of the ventilation hose and check for negative pressure (vacuum) with finger.
NOTE: At this time, the plunger in the PCV valve should move back and forth as the open end is covered and uncovered.
(3) If negative pressure is not felt, clean or replace the PCV valve. Inspect the vacuum supply hose and vacuum supply hose port for restriction or
plugged condition.