GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Air Cleaner Outlet Duct Replacement

Removal Procedure

    Object Number: 1670786 Size: SH
  1. Disconnect the engine harness electrical connector from the mass air flow (MAF)/intake air temperature (IAT) sensor.

    2. Object Number: 1661022 Size: SH
  2. Disconnect the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air cleaner outlet duct. Refer to Plastic Collar Quick Connect Fitting Service.

    3. Object Number: 1670790 Size: SH
  3. Loosen the air cleaner outlet duct clamp at the throttle body.
  4. Remove the air cleaner outlet duct from the throttle body.

    5. Object Number: 1670799 Size: SH
  5. Loosen the air cleaner outlet duct from the MAF/IAT sensor.
  6. Remove the air cleaner outlet duct from the MAF/IAT sensor and the vehicle.

Installation Procedure

    Object Number: 1670799 Size: SH
  1. Install air cleaner outlet duct to the vehicle and the MAF/IAT sensor.

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

  2. Tighten the air cleaner outlet duct clamp at the MAF/IAT sensor.

    3. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 1670790 Size: SH
  3. Install the air cleaner outlet duct to the throttle body.
  4. Tighten the air cleaner outlet duct clamp at the throttle body.

    5. Tighten
    Tighten the clamp to 4 N·m (35 lb in).


    Object Number: 1661022 Size: SH
  5. Connect the PCV fresh air tube quick connect fitting to the air cleaner outlet duct. Refer to Plastic Collar Quick Connect Fitting Service.

    6. Object Number: 1670786 Size: SH
  6. Connect the engine harness electrical connector to the MAF/IAT sensor.