Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

Symptom	Correction
External oil leak	Inspect for any of the following conditions: Restricted positive crankcase ventilation (PCV) valve Restricted or kinked PCV hose or engine vent hose Damaged, incorrect, or incorrectly installed PCV valve or hose Excessive crankcase pressure
Rough Idle	Inspect for any of the following conditions: Restricted PCV valve Restricted or kinked PCV hose or engine vent hose Leaking (damaged) PCV valve or hose Vacuum hoses worn or not properly installed
Stalling or slow idle speed	Inspect for any of the following conditions: Restricted PCV valve Restricted or kinked PCV hose or engine vent hose Leaking (damaged) PCV valve or hose
High idle speed	Inspect for a leaking (damaged) PCV valve or hose
Sludge in the engine	Inspect for any of the following conditions: Restricted PCV valve Restricted or kinked PCV hose or engine vent hose