Positive Crankcase Ventilation: Testing and Inspection

1. Start engine and idle.

PCV Test:

2. Remove hose from PCV valve and check for vacuum.
Should have strong vacuum.
If not proceed to step #3.
3. Remove PCV valve and shake to check if it is sticking.
If OK proceed to step #4.
If not OK, replace valve.

PCV Hose Test:

4. Check all hoses for restrictions.
Clean or replace hoses as necessary.