GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Throttle Body Assembly Replacement

Removal Procedure

Caution: Handle the electronic throttle control components carefully. Use cleanliness in order to prevent damage. Do not drop the electronic throttle control components. Do not roughly handle the electronic throttle control components. Do not immerse the electronic throttle control components in cleaning solvents of any type.

Note: 

   • DO NOT for any reason, insert a screwdriver or other small hand tool into the throttle body to hold open the throttle plate as a wedge, as the inside of the throttle body could be damaged.
   • An 8-digit part identification number is stamped on the throttle body casting. Refer to this number, if servicing or part replacement is required.


    Object Number: 1608290 Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  3. Disconnect the electronic throttle control (ETC) electrical connector (2).

    4. Object Number: 1608325 Size: SH
  4. Remove the heater inlet and outlet pipe clip nuts from the throttle body studs.
  5. Reposition the heater inlet and outlet hose/pipe.

    6. Object Number: 1608805 Size: SH
  6. Remove the throttle body bolts/studs.
  7. Remove the throttle body.
  8. Remove and discard the throttle body gasket.

Installation Procedure

Note: DO NOT reuse the throttle body gasket. Install a NEW gasket during assembly.


    Object Number: 1608805 Size: SH
  1. Install a NEW throttle body gasket. Align the locating tab of the gasket with the notch in the manifold.
  2. Position the throttle body to the intake manifold.

    3. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the throttle body bolts and tighten to 10 N·m (89 lb in).

    4. Object Number: 1608325 Size: SH
  4. Position the heater inlet and outlet hose/pipe.
  5. Position the heater inlet and outlet hose clamps at the engine pipes.
  6. Install the heater inlet and outlet pipe clip nuts to the throttle body studs and tighten to 10 N·m (89 lb in).

    7. Object Number: 1608290 Size: SH

    Note: Verify that the throttle actuator motor harness connector and the connector seal are properly installed and not damaged.

  7. Connect the ETC electrical connector (2).
  8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  9. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  10. Connect a scan tool in order to test for proper throttle opening and throttle closing ranges.
  11. Operate the accelerator pedal and monitor the throttle angles.

    12. The accelerator pedal should operate freely, without binding, between closed throttle, and wide open throttle (WOT).

  12. Verify that the vehicle meets the following conditions:
    13. • The vehicle is not in a reduced engine power mode.
    • The ignition is ON.
    • The engine is OFF.
  13. Perform the Throttle Learn Procedure. Refer to Throttle Learn.