Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Ford >> 2012 >> Fiesta SES, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Emission Control System >> Description And Operation >> Engine Emission Control >> Crankcase Ventilation >> System Operation

System Operation

During high intake manifold vacuum situations the blow-by pressure flows through the crankcase pressure regulator and is returned to the intake manifold through the crankcase vent oil separator hose. During low intake manifold vacuum situations the crankcase pressure regulator restricts flow to the intake manifold causing blow-by pressure to flow through the valve cover vent hose to the air cleaner.

scientia non olet · About Mike's Workshop Manuals