Malibu V6-3.5L VIN 8 (2004)
Positive Crankcase Ventilation: Testing and Inspection
Crankcase Ventilation System Inspection/Diagnosis
Results Of Incorrect Operation
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A plugged valve (3) or hose (2 & 4) may cause the following conditions:
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Rough idle
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Stalling or a low idle speed
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Oil leaks
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Oil in the air cleaner
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Sludge in the engine
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A leaking crankcase ventilation valve (3) or hose (2 & 4) may cause the following conditions:
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Rough idle
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Stalling
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High idle speed
Functional Test
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 intake
passages and is drawn into the engine.
Proper operation of the crankcase ventilation system depends upon a sealed engine. If oil sludging or dilution is noted and the crankcase ventilation
system is functioning properly, inspect the engine for a possible cause. Correct any problems.
If an engine is idling rough, inspect for a clogged crankcase ventilation valve, a dirty vent filter or air cleaner element, or a plugged hose. Replace any
components as required. Refer to the following procedure:
