Positive Crankcase Ventilation: Testing and Inspection

Crankcase Ventilation System:

1. 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:
Loose hose connections
Missing hose clamps
Condition of hoses (brittle, cracked, oil soaked, collapsed, etc.)
Blocked passages
2. 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.
3. If necessary, check the PCV connections 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.
4. The by-pass valve operates during idle and deceleration when the throttle valve is closed. The valve opens at high vacuum, and allows air to circulate without increasing boost pressure. this allows the turbine to freely rotate until the throttle is opened again.