GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 3.9L 🢒 Lower Intake Manifold Cleaning and Inspection

    Object Number: 1608919 Size: SH
  1. Clean the intake manifold gasket mating surfaces (3) using GM P/N 12346139 (Canadian P/N 10953463) or equivalent.
  2. Clean the fuel injector bores (1).
  3. Inspect the lower intake manifold locating pins (2) for damage. Replace as necessary.
  4. Inspect the intake manifold for damage.

    5. Important: If replacing the lower intake manifold, make sure to transfer or replace the locating pins as necessary.

  5. Repair or replace the intake manifold as necessary.