How does a Closed Crank Ventilation Systems work (on-road vehicles only)?
During the engine combustion process crank emissions are created. These emissions are typically composed of PM, unburned fuel, and hydrocarbon vapor. Crank systems effectively close off this crankcase, thus eliminating the emissions without impacting engine performance. The general maintenance of the CCV system involves replacing the filter which is similar to changing the engine oil. Higher mileage on-road engines will typically need maintenance every 25,000 miles, while low-mileage vehicles are recommended to be maintenance annually.
