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Home >> Chevrolet >> 2004 >> Optra5 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.8L (L79) - Repair Instructions >> Repair Instructions >> Throttle Body Assembly Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: View Of Throttle Body And Retaining Nuts
    GM1256155Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Safety Glasses Caution .
    NOTE: 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. NOTE: 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 TP sensor. Refer to Throttle Position Sensor Replacement .
  4. Install the IAC valve. Refer to Idle Air Control Valve Replacement .
  5. Install the throttle body assembly with a new gasket to the intake manifold.
    6. NOTE: Refer to Fastener Notice .
  6. Install the throttle body retaining nuts.

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

    7. Fig 2: Identifying Sensors, Connectors And Covers
    GM1289506Courtesy of GENERAL MOTORS CORP.
  7. Connect the TP sensor connector and the IAC valve connector.
  8. Connect the coolant hoses to the throttle body.
  9. Connect the vacuum hoses to the throttle body.
    10. IMPORTANT: Make sure the throttle/cruise control cables do not hold the throttle open. With the engine OFF, check to see that the accelerator pedal is free.
  10. Connect the throttle cable.
  11. Install the air intake tube.
  12. Connect the breather hose to the valve cover.
  13. Connect the IAT sensor connector.
  14. Connect the negative battery cable.
  15. Fill the cooling system.
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