GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Engine 🢒 Engine Mechanical - 3.0L 🢒 Intake Manifold Flange Replacement

Removal Procedure

    Object Number: 158565 Size: SH

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the intake plenum. Refer to Intake Plenum Replacement .
  3. Remove the intake manifold. Refer to Intake Manifold Replacement .
  4. Remove the intake manifold flange bolts (1).

    5. Important: After the intake manifold flange is removed, mask off the ports to prevent foreign objects from entering the engine.

  5. Remove the intake manifold flange (2).

    6. Object Number: 159490 Size: SH
  6. Clean the cylinder head sealing surfaces with a non-abrasive tool or solvent.

Installation Procedure

    Object Number: 159490 Size: SH
  1. Remove the masking from the cylinder head intake ports.

    2. Object Number: 158565 Size: SH
  2. Ensure the seals on the intake manifold flange are properly seated and installed.
  3. Install the intake manifold flange (2).

    4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the intake manifold flange bolts (1).

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

  5. Install the intake manifold. Refer to Intake Manifold Replacement .
  6. Install the intake plenum. Refer to Intake Plenum Replacement .
  7. Connect the negative battery cable.
  8. Reprogram the applicable accessories. Refer to Reprogramming Accessories After Battery Disconnect in Engine Electrical.