Crankcase Ventilation System Inspection/Diagnosis. Chevrolet Tahoe

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2004 🢒 Tahoe - 4WD 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Crankcase Ventilation System Inspection/Diagnosis

Symptom

Correction

External oil leak

Inspect for any of the following conditions:

•	Restricted or kinked PCV hose or engine vent hose

•	Damaged, incorrect, or incorrectly installed PCV hose

•	Excessive crankcase pressure

Rough Idle

Inspect for any of the following conditions:

•	Restricted or kinked PCV hose or engine vent hose

•	Leaking (damaged) PCV hose

•	Vacuum hoses worn or not properly installed

Stalling or slow idle speed

Inspect for any of the following conditions:

•	Restricted or kinked engine vent hose

•	Leaking (damaged) PCV hose

High idle speed

Inspect for a leaking (damaged) PCV hose

Sludge in the engine

Inspect for restricted or kinked PCV hose or engine vent hose