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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Crankcase Ventilation System Inspection/Diagnosis

Concern Action
IMPORTANT: Oil in the charged air cooler, hoses, turbocharger, or intake manifolds is normal with a closed crankcase ventilation system.
The maximum crankcase pressure is 4 kPa or 16 in of water at 3,100 RPM measured at the oil level indicator tube.
PVC check valve stuck closed
  • Excessive crankcase pressure
  • Possible oil leaks. Replace the valve.
Odors Normal situation
Noise Cracked hoses
Smoke Damaged PCV diaphragm
Excessive Oil Consumption Damaged PCV diaphragm, missing or broken spring
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