Crankcase Ventilation (CV) System Inspection
| • | Test for vacuum at the positive crankcase ventilation (PCV) dirty air hose where it connects to the vacuum orifice tube in the engine valley cover. There should be a manifold vacuum present at the hose. If there is no vacuum, inspect for a plugged
hose, leaking hose or a plugged intake manifold passage. |
| • | If oil has accumulated in the intake , inspect for the following conditions: |
| - | Plugged vacuum orifice tube in the engine valley cover |
| - | Plugged, restricted, or leaking PCV dirty air hose |
| - | Plugged or restricted intake manifold passage |
| - | Excessive crankcase pressure or blow-by |
| • | Additional items to inspect: |
| - | Plugged or restricted PCV fresh air hose |
| - | Inspect the valve rocker arm cover, the oil pan, engine front cover, and other sealing areas for leaks |
Results of Incorrect Operation
A plugged crankcase ventilation system may contribute to the following conditions:
| • | Stalling or a slow idle speed |
| • | Oil accumulation in the intake manifold |
A leaking hose may contribute to the following conditions:
The crankcase ventilation system has no serviceable components so no maintenance of the system is required.
