Results Of Incorrect Operation
• | A plugged positive crankcase ventilation (PCV) orifice or hose
may cause the following conditions: |
- | Stalling or slow idle speed |
• | A leaking PCV orifice or hose may cause the following conditions: |
Functional Check
With these systems, any blow-by in excess of the system capacity, from a badly
worn engine, sustained heavy load, etc., is exhausted into the air cleaner and is
drawn into the engine.
Proper operation of the crankcase ventilation system depends upon a sealed engine.
If oil slugging or dilution is noted and the crankcase ventilation system is functioning
properly, check the engine for a possible cause. Correct any problems.
If an engine is idling rough, inspect for a clogged PCV orifice, a dirty vent
filter, air cleaner element, or plugged hose. Replace as required. Use the following
procedure:
- Remove the PCV hose from the rocker arm cover.
- Operate the engine at idle.
- Place your thumb over the end of the hose in order to check for a vacuum.
If there is no vacuum at the hose, inspect for the following items:
- Turn OFF the engine.
- Inspect the PCV orifice in the valve cover for debris or blockage.