Crankcase Ventilation System Inspection/Diagnosis: Inspection
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Periodically, inspect the entire system and replace any parts showing signs of deterioration. Refer to VALVE ROCKER ARM COVER REPLACEMENT in Engine Mechanical.