GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2001 🢒 Aurora 🢒 Engine 🢒 Engine Controls - 4.0L 🢒 Crankcase Ventilation System Inspection/Diagnosis

Concern

Action

External oil leak

Inspect for any of the following conditions:

    • Plugged positive crankcase ventilation (PCV) valve.
    • Plugged or kinked PCV hose(s).
    • Damaged or incorrectly installed PCV valve or hose(s).
    • Excessive crankcase pressure.

Rough Idle

Inspect for any of the following conditions:

    • Plugged PCV valve.
    • Plugged or kinked PCV hose(s).
    • Leaking (damaged) PCV valve or hose(s).

Stalling or slow idle speed

Inspect for any of the following conditions:

    • Plugged PCV valve.
    • Plugged or kinked PCV hose(s).
    • Leaking (damaged) PCV valve or hose(s).

High idle speed

Inspect for a leaking (damaged) PCV valve or hose(s).

Sludge in the engine

Inspect for any of the following conditions:

    • Plugged PCV valve.
    • Plugged or kinked PCV hose(s).