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Diagnostic Aids

Perform this test when instructed during QUICK TEST  or if directed by other test procedures. Use this test to diagnose Positive Crankcase Ventilation (PCV) valve and related vacuum hoses.

  1. 1) Check PCV Valve  Remove PCV valve. Shake valve and listen for rattle. If PCV valve rattles when shaken, go to next step. Replace PCV valve if it does not rattle when shaken.
  2. 2) Check PCV System  Idle engine until warm. Remove fresh air hose at inlet end. Plug nipple immediately to prevent stalling. Verify presence of vacuum at inlet end of hose. If vacuum is present, PVC system is okay. If there is no vacuum, check for plugged or leaking PCV hose, or loose dipstick tube. If okay, replace PCV valve.
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