Neon L4-2.0L SOHC (1995)
Positive Crankcase Ventilation: Testing and Inspection
PCV SYSTEM INSPECTION
WARNING: Apply parking brake and/or block wheels before performing any test or adjustment with the engine operating.
1. With engine idling, remove the vapor hose from the PCV valve.
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If the valve is not plugged, a hissing noise will be heard as air passes through the valve.
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A strong vacuum should also be felt when a finger is placed over the valve inlet.
2. Install hose on PCV valve.
3. Remove the make-up air hose from the air plenum at the rear of the engine.
4. Hold a piece of stiff paper (parts tag) loosely over the end of the make-up air hose.
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After allowing approximately one minute for crankcase pressure to reduce, the paper should draw up against the hose with noticeable force.
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If the engine does not draw the paper against the grommet after installing a new valve, replace the PCV valve hose.
5. Turn the engine off.
6. Remove the PCV valve from intake manifold.
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The valve should rattle when shaken.
NOTE: If THE PCV VALVE does not operate as described in the preceding tests, replace the PCV valve and retest the system. DO NOT attempt to
clean the old PCV valve.