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Home >> Pontiac >> 2006 >> Vibe Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Control System - 1.8L (LNK) - Troubleshooting & Diagnosis) >> Crankcase Ventilation System Inspection/Diagnosis

Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different variant/trim than selected.
  1. Remove the positive crankcase ventilation (PCV) valve. Refer to Positive Crankcase Ventilation Valve Replacement .
    2. Fig 1: Blowing Air Into Cylinder Head
    GM607625Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.
  2. Blow air into the cylinder head side of the PCV valve.
  3. Check that air passes through the PCV valve easily.
    4. Fig 2: Blowing Air Into Intake Manifold
    GM607623Courtesy of GENERAL MOTORS CORP.
  4. Blow air into the intake manifold side of the PCV valve.
  5. Check that air passes through the PCV valve with high resistances.
  6. If the PCV valve fails either test, replace the PCV valve. Refer to Positive Crankcase Ventilation Valve Replacement .
  7. Inspect the PCV hose for damage, restrictions, or leaks. Replace the hose as necessary.
  8. Inspect all PCV system passages and connections for leaks or restrictions. Repair as necessary.
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