posted 07-08-2002 03:56 PM                  

Diagnosis and testing of PCV System

1. With the engine idling, remove the hose from the pcv valve. If the valve is not plugged, a hissing noise will be heard as air passes through the valve. A strong vacuum should also be felt when a finger is placed over the valve inlet.

2. Install hose on PCV valve. Remove the make up air hose from the air plenum at the rear of the engine. Hold a piece of stiff paper (parts tag) loosely over the end of the make up air hose.

3. After allowing approximately one minute for the crankcase prssure to reduce, the paper shoould draw up against the hose with noticeable force. If the engine does not draw the paper against the gromnet after installing a new valve replace the pcv valve hose.

4. Turn off the engine. Remove the pcv valve frm intake manifold. The valve should rattle when shaken.

5. Replace the PCV valve and retest the system if is does not operate as described in the preceeding tests.
Do not attempt to clean the old PCV valve. If the valve rattles, apply a light coat of Loctite Pipe Sealent With Telfon to the threads. Thread the pcv valve into the manifold plenum and tighten to N.m (60 in. lbs.) torgue.

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