Vibe FWD L4-1.8L VIN L (2005)
Positive Crankcase Ventilation Valve: Description and Operation
PCV VALVE
PCV Valve Operation
One side of the PCV valve is exposed to manifold vacuum and the other side is exposed to crankcase gases. The PCV valve allows some vacuum
pressure to pass through the valve orifice and create a low pressure condition in the crankcase. The blow-by gases in the crankcase are then drawn into
the intake system and consumed in the normal combustion process. The volume of blow-by gas entering the intake manifold is precisely controlled In
order to maintain idle quality. The correct PCV valve with the proper calibration must be used. The relationship between the flow of blow-by gas and the
engine manifold vacuum is charted in the table.