Positive Crankcase Ventilation: Testing and Inspection

Crankcase Emission Control:

The integrity of the PCV system is critical to the proper functioning of the fuel system. Before making major adjustments or replacing components in the fuel system check the PCV system for:
1. Loose hose connections
2. Missing hose clamps
3. Condition of hoses (brittle, cracked, oil soaked, collapsed, etc.)
4. Blocked passages

Any hose or fitting found to be weak, collapsed or broken should be replaced with an approved fuel/fuel-vapor type hose. Any other type of hose material is not suitable for PCV system use.

Crankcase Ventilation Valve:

Crankcase Ventilation Hose:

Air should pass freely through the crankcase ventilation valve. If necessary, check the inside of the valve cover area where the PCV connections are, for sludge build-up that could interfere with crankcase vapor return. Should this area become clogged, high crankcase pressure would result and cause abnormal amounts of oil leakage from some or all engine gaskets and seals. Clean passages as necessary. If a restriction is found in the crankcase ventilation valve, the valve should be replaced.