Grand Prix V6-204 3.4L DOHC VIN X SFI (1995)
Positive Crankcase Ventilation Valve: Testing and Inspection
Crankcase Ventilation Valve Cross Section
PCV Hose And Valve
FUNCTIONAL CHECK OF CRANKCASE VENTILATION VALVE
If an engine is idling rough, check for a clogged crankcase ventilation valve. Replace as required. Use the following procedure:
1. Remove crankcase ventilation valve from intake manifold.
2. Shake valve and listen for the rattle of needle inside the valve. If valve does not rattle, replace valve.
With this system, any blow-by in excess of the system capacity (from a badly-worn engine, sustained heavy load, etc.) is exhausted into the inlet
duct and is drawn into the engine.
Proper operation of the crankcase ventilation system is dependent upon a sealed engine. If oil sludging or dilution is noted, and the crankcase
ventilation system is functioning properly, check engine for possible cause and correct to ensure that system will function as intended.
