GM Service Manual Online
For 1990-2009 cars only

Concern

Action

External oil leak

Inspect for any of the following conditions:

    â€¢ Plugged positive crankcase ventilation (PCV) orifice tube.
    â€¢ Plugged or kinked PCV hoses.
    â€¢ Damaged or incorrectly installed PCV hoses.
    â€¢ Excessive crankcase pressure.

Rough Idle

Inspect for any of the following conditions:

    â€¢ Plugged PCV orifice tube.
    â€¢ Plugged or kinked PCV hoses.
    â€¢ Leaking or damaged PCV hoses.

Stalling or slow idle speed

Inspect for any of the following conditions:

    â€¢ Plugged PCV orifice tube.
    â€¢ Plugged or kinked PCV hoses.
    â€¢ Leaking or damaged PCV hoses.

High idle speed

Inspect for a leaking or damaged PCV hoses.

Sludge in the engine

Inspect for any of the following conditions:

    â€¢ Plugged PCV orifice tube.
    â€¢ Plugged or kinked PCV hoses.