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