Crankcase Ventilation System Inspection/Diagnosis (1.6L LLU)
|
Crankcase Ventilation System Inspection/Diagnosis (1.6L LLU)
|
Results of Incorrect Operation
|
A plugged positive crankcase ventilation (PCV) orifice or hose may cause the following conditions:
•
|
Stalling or slow idle speed
|
•
|
Oil in the throttle body
|
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 throttle body 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 necessary. Use the following procedure:
1.
|
Remove the PCV hose from the intake manifold and from the cylinder head cover.
|
3.
|
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:
|
4.
|
Switch off the engine.
|
5.
|
Inspect the PCV orifice in the intake manifold and in the cylinder head cover for debris or blockage.
|