GM Service Manual Online
For 1990-2009 cars only

Symptom

Correction

External oil leak

Inspect for any of the following conditions:

    • Restricted or kinked positive crankcase ventilation (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 low 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