GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .

  3. Object Number: 1811485  Size: SH
  4. Disconnect the engine wiring harness electrical connectors (2, 3) from the appropriate camshaft position (CMP) actuator solenoid valve.

  5. Object Number: 1578482  Size: SH
  6. Remove the exhaust CMP actuator solenoid valve bolt and valve (1), if required.
  7. Remove the intake CMP actuator solenoid valve bolt and valve (2), if required.
  8. Inspect the CMP actuator solenoid valve O-ring seals for damage, replace as necessary.

Installation Procedure


    Object Number: 1578482  Size: SH
  1. Lubricate the CMP actuator solenoid valve O-ring seals with clean engine oil.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the intake CMP actuator solenoid valve (2) and bolt, if required.
  4. Tighten
    Tighten the bolt to 10 N·m (89 lb in).

  5. Install the exhaust CMP actuator solenoid valve (1) and bolt, if required.
  6. Tighten
    Tighten the bolt to 10 N·m (89 lb in).


    Object Number: 1811485  Size: SH
  7. Connect the engine wiring harness electrical connectors (2, 3) to the appropriate CMP actuator solenoid valve.
  8. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  9. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .

Removal Procedure

  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.

  3. Object Number: 1811485  Size: SH
  4. Disconnect the engine wiring harness electrical connectors (2, 3) from the appropriate camshaft position (CMP) actuator solenoid valve.

  5. Object Number: 1578482  Size: SH
  6. Remove the exhaust CMP actuator solenoid valve bolt and valve (1), if required.
  7. Remove the intake CMP actuator solenoid valve bolt and valve (2), if required.
  8. Inspect the CMP actuator solenoid valve O-ring seals for damage, replace as necessary.

Installation Procedure


    Object Number: 1578482  Size: SH
  1. Lubricate the CMP actuator solenoid valve O-ring seals with clean engine oil.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the intake CMP actuator solenoid valve (2) and bolt, if required.
  4. Tighten
    Tighten the bolt to 10 N·m (89 lb in).

  5. Install the exhaust CMP actuator solenoid valve (1) and bolt, if required.
  6. Tighten
    Tighten the bolt to 10 N·m (89 lb in).


    Object Number: 1811485  Size: SH
  7. Connect the engine wiring harness electrical connectors (2, 3) to the appropriate CMP actuator solenoid valve.
  8. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  9. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.