323 L4-1800cc 1.8L OHC (1991)
Positive Crankcase Ventilation Valve: Description and Operation
PCV Valve
The PCV valve is operated by the intake manifold vacuum to prevent blow-by gas from escaping to the atmosphere. When the engine is running at idle,
the PCV valve is slightly opened and a small amount of blow-by gas is drawn into the combustion chamber. At higher engine speeds the PCV valve is
further opened and a large amount of blow-by gas is drawn into the combustion chamber.