GM Service Manual Online
For 1990-2009 cars only

Concern

Action

External oil leak

Inspect for any of the following conditions:

    • Restricted or kinked positive crankcase ventilation (PCV) tube or engine vent hose
    • Damaged, incorrect or incorrectly installed PCV tube
    • Excessive crankcase pressure

Rough Idle

Inspect for any of the following conditions:

    • Restricted or kinked PCV tube or engine vent hose
    • Leaking (damaged) PCV tube

Stalling or slow idle speed

Inspect for any of the following conditions:

    • Restricted or kinked engine vent hose
    • Leaking (damaged) PCV tube

High idle speed

Inspect for a leaking (damaged) PCV tube

Sludge in the engine

Inspect for a restricted or kinked PCV tube or engine vent hose