Results Of Incorrect Operation
| • | A plugged valve or hose (4)
may cause the following conditions: |
| - | Stalling or a slow idle speed |
| • | A leaking crankcase ventilation valve or hose may cause the following
conditions: |
Functional Check
With these systems, any blow-by in excess of the system capacity is
exhausted into the air intake passages and 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, check for a clogged crankcase ventilation
valve, a dirty vent filter, air cleaner element, or plugged hose. Replace
any components as required. Use the following procedure:
- Remove the crankcase
ventilation valve from the rocker arm cover.
- Operate the engine at idle.
- Place your thumb over the end of the valve in order to check
for a vacuum. If there is no vacuum at the valve, check for the following
items:
| • | A plugged manifold port |
| • | A plugged crankcase ventilation valve |
- Turn OFF the engine
- Remove the crankcase ventilation valve
- Shake the valve
- Listen for the rattle of the check needle inside of the valve.
If valve does not rattle, replace the valve.
