Positive Crankcase Ventilation: Testing and Inspection

1. With engine idling, remove the Crankcase Ventilation (CCV) fitting.
a. If the fitting is not plugged, a hissing sound will be heard as air passes through the orifice, and a strong vacuum should be felt when a finger is placed over the inlet of the orifice.
b. Install the CCV fitting.
c. Remove the fresh air hose from the air cleaner assembly and loosely hold a piece of paper over the open end of the hose. After allowing about a minute for the crankcase pressure to reduce, the paper should be sucked against the opening with a noticeable amount of force.
2. Turn the engine OFF. Remove the metered orifice fitting, and check for a plugged condition.
3. If the crankcase ventilation system meets the tests no further service is required. If not, the CCV fitting must be cleaned and the system checked again.
4. If the test fails after the CCV fitting is cleaned, it will be necessary to replace the molded vacuum hose and clean the metered orifice port.
5. Clean or replace the air cleaner.