GM Service Manual Online
For 1990-2009 cars only

Condition

Action

Air inlet leaks or obstructions

Inspect for leaks or obstructions in the turbocharger inlet pipes/hoses.

Leaking charge air cooler/pipes/hoses

Inspect for leaks or obstructions in the charge air cooler/pipes/hoses using J 46091 .

Leaking or restricted exhaust system

  1. Inspect for a leak in the exhaust system.
  2. Inspect for a restricted exhaust system.

Intake system leaks or obstructions

  1. With the engine off, pressurize the intake system using J 46091 and inspect for intake manifold leaks.
  2. Inspect for obstructions in the intake manifolds.