GM Service Manual Online
For 1990-2009 cars only

Concern

Action

External oil leak

Inspect for any of the following conditions:

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

Rough Idle

Inspect for any of the following conditions:

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

Stalling or slow idle speed

Inspect for any of the following conditions:

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

High idle speed

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

Sludge in the engine

Inspect for any of the following conditions:

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