Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Pontiac Vibe FWD L4-1.8L VIN 8FACTORY OEM SERVICE PROCEDURE
Positive Crankcase Ventilation: Testing and Inspection
CRANKCASE VENTILATION SYSTEM INSPECTION/DIAGNOSIS
1. Remove the positive crankcase ventilation (PCV) valve.
2. Blow air into the cylinder head side of the PCV valve.
NOTE: Refer to Fuel Vapors in Evaporative Emission (EVAP) Components Caution in Service Precautions.
3. Check that air passes through the PCV valve easily.
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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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