Positive Crankcase Ventilation: Testing and Inspection

1. Remove PCV Valve from rocker cover.
2. PCV Valve plunger inside should rattle when shaken.
If so, reinstall PCV Valve and proceed to the next step.
If not, replace PCV Valve.
3. Start engine and idle until normal operating temperature is reached.
4. With engine at idle, disconnect the PCV hose leading from the air cleaner housing to the throttle body.
5. Place a piece of paper over the hose end.
6. Wait one minute. Vacuum should hold the paper in place.
If so, reconnect hose(s), PCV system is okay.
If not, the crankcase is being vented through a leak.

7. Disconnect the EVAP hose from the charcoal canister, at the PCV Valve union.
8. Cap the connecting nipple where the EVAP hose was attached.
9. Retest the PCV System using the above procedures.
10. Wait one minute. Vacuum should hold the paper in place.
If so, the EVAP System should be tested for a vacuum leak.
If not, check rubber grommets and connecting hoses for vacuum leaks. Check vacuum fittings and throttle body ports for possible obstructions.