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.
A plugged positive crankcase ventilation (PCV) pipe/passage way may cause:
- Rough idle
- Stalling or slow idle speed
- Oil leaks
- Sludge in the engine