Savana 1500 RWD V6-4.3L (2007)
Positive Crankcase Ventilation: Testing and Inspection
Crankcase Ventilation System Inspection/Diagnosis
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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Rough idle
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Stalling or slow idle speed
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Oil leaks
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Oil in air cleaner
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Sludge in engine
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A leaking PCV orifice or hose may cause the following conditions:
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Rough idle
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Stalling
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High idle speed
Functional Check
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 cleaner
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 required. Use the
following procedure:
1. Remove the PCV hose from the rocker arm cover.
2. Operate the engine at idle.
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:
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Plugged hoses
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The manifold port
4. Turn OFF the engine.
5. Inspect the PCV orifice in the valve cover for debris or blockage.