GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Optra 🢒 Engine 🢒 Engine Controls and Fuel - 2.0L (L34 GMDAT) 🢒 Throttle Body Assembly Replacement

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1669825 Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the intake air temperature (IAT) sensor connector.
  3. Disconnect the breather hose from the valve cover.
  4. Remove the air intake tube.

    5. Object Number: 1256156 Size: SH
  5. Disconnect the vacuum hoses from the throttle body.
  6. Disconnect the electronic throttle control (ETC) connector.
  7. Disconnect the coolant hoses from the throttle body.
  8. Remove the throttle body retaining nuts.

    9. Important: Cover the opening of the intake manifold after removing the throttle body assembly. This will prevent any objects or debris from entering the engine which may cause damage.

  9. Remove the throttle body and discard the gasket.

Installation Procedure

    Object Number: 1669825 Size: SH

    Notice: Use care when cleaning the old gasket from the aluminum surfaces in order to prevent damage to the sealing surfaces.

  1. Clean the gasket mating surface on the intake manifold.

    2. Notice: Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:

       • Throttle position (TP) sensor
       • Idle air control (IAC) valve
       • Sealed throttle shaft bearings
    The cleaners will damage the electric components or sensors.

    The cleaners will damage some of these components that contain seals or O-rings.

    Solvents can wash away or break down the grease used on non-serviceable throttle shaft bearings.

    Never use a wire brush or scraper to clean the throttle body. A wire brush or sharp tools may damage the throttle body components.

    Do not use a cleaner that contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.

  2. Clean the throttle body.
  3. Install the throttle body assembly with a new gasket to the intake manifold.

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

  4. Install the throttle body retaining nuts.

    5. Tighten
    Tighten the throttle body retaining nuts to 10 N·m (89 lb in).


    Object Number: 1289506 Size: SH
  5. Connect the coolant hoses to the throttle body.
  6. Connect the ETC connector.
  7. Connect the vacuum hoses to the throttle body.
  8. Install the air intake tube.
  9. Connect the breather hose to the valve cover.
  10. Connect the IAT sensor connector.
  11. Connect the negative battery cable.
  12. Fill the cooling system.