GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 CTS - RHD 🢒 Engine 🢒 Engine Cooling 🢒 Intake Manifold Flange Replacement

Removal Procedure
  1. Remove the intake manifold. Refer to Intake Manifold Replacement .

    2. Object Number: 788790 Size: SH
  2. Remove the intake manifold flange bolts (1).
  3. Remove the intake manifold flange (2) from the cylinder heads.

    4. Object Number: 159490 Size: SH
  4. Mask off the ports to the cylinder heads, in order to prevent foreign objects from entering the engine.

Installation Procedure

    Object Number: 159490 Size: SH
  1. Remove the masking from the cylinder head intake ports and ensure the sealing surfaces are clean and dry.

    2. Object Number: 788790 Size: SH

    Important: Ensure the seals on the intake manifold flange are properly seated and installed.

  2. Position the intake manifold flange (2) to the cylinder heads.
  3. Apply thread adhesive GM P/N 12345382, (Canadian P/N 10953489) to the intake manifold flange bolts.

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 788807 Size: SH
  4. Install the intake manifold flange bolts.

    5. Tighten
    Tighten the intake manifold flange bolts in sequence to 20 N·m (15 lb ft).

  5. Install the intake manifold. Refer to Intake Manifold Replacement .