GM Service Manual Online
For 1990-2009 cars only

Concern

Action

External oil leak

Inspect for any of the following conditions:

    • Plugged or kinked PCV hose(s)
    • Damaged or incorrectly installed PCV hose(s)
    • Excessive crankcase pressure

Rough Idle

Inspect for any of the following conditions:

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

Stalling or slow idle speed

Inspect for any of the following conditions:

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

High idle speed

Inspect for a leaking (damaged) PCV hose(s)

Sludge in the engine

Inspect for plugged or kinked PCV hose(s)