Corsica V6-173 2.8L (1987)
Positive Crankcase Ventilation Valve: Testing and Inspection
TEST DESCRIPTION
If an engine is idling rough, check for a clogged Positive Crankcase Ventilation (PCV) valve or plugged hose. Check PCV part number to be sure
the correct PCV is installed. Replace as required. Use the following procedure:
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Remove PCV valve from rocker arm cover.
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Run the engine at idle.
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Place your thumb over end of valve to check for vacuum. If there is no vacuum at valve, check for plugged hoses or manifold port or PCV
valve. Replace plugged or deteriorated hoses.
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Turn "OFF" the engine and remove PCV valve. Shake valve and listen for the rattle of check needle inside the valve. If valve does not rattle,
replace valve.
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With this system, any blow-by in excess of the system capacity (from a badly-worn engine, sustained heavy load, etc..) is exhausted into the
inlet duct and is drawn into the engine.
RESULTS OF INCORRECT OPERATION.
A plugged valve or hose may cause:
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Rough idle
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Stalling or slow idle speed
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oil leaks
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oil in throttle body or plenum
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Sludge in engine
A leaking valve or hose would cause:
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Rough idle
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Stalling
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High idle speed
COMPONENT MAINTENANCE
Proper operation of the PCV system is dependent upon a sealed engine. If oil sludging or dilution is noted and the PCV system is functioning
properly, check engine for possible cause and correct to ensure that system will function as intended.
An engine which is operated without any crankcase ventilation can be damaged. Therefore, it is important to replace the PCV valve at intervals
shown in Maintenance.
Periodically, inspect the hoses and clamps and replace any showing signs of deterioration.
