GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Epica 🢒 Engine 🢒 Engine Controls - 2.5L (LBK) 🢒 Throttle Body Assembly Replacement

Removal Procedure

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


    Object Number: 1375157 Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the air filter outlet hose.

    3. Object Number: 1375158 Size: SH
  3. Disconnect the throttle cable by opening the throttle and moving the cable through the release slot.

    4. Object Number: 1375160 Size: SH
  4. Remove the coolant inlet and outlet hoses from the throttle body assembly.
  5. Disconnect the main throttle idle actuator (MTIA) connector.

    6. Object Number: 1375161 Size: SH
  6. Remove the throttle body assembly.

    7. Important: Inspect the throttle body gasket for distortion or damage.

  7. Remove the throttle body gasket.

Installation Procedure

    Object Number: 1375155 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 assembly retaining bolts to 13 N·m (115 lb in).


    Object Number: 1375160 Size: SH
  5. Connect the MTIA connector.
  6. Install the coolant inlet and outlet hoses the throttle body assembly.

    7. Object Number: 1375158 Size: SH
  7. Connect the throttle cable.

    8. Object Number: 1375157 Size: SH
  8. Install the air filter outlet hose.
  9. Connect the negative battery cable.