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

    Fig 1: Identifying Sensors, Connectors And Covers
    GM1289506Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Battery Disconnect Caution .
  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. Fig 2: View Of Throttle Body And Retaining Nuts
    GM1256155Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the throttle cables by opening the throttle and moving the cable through the release slot.
  6. Disconnect the vacuum hoses from the throttle body.
  7. Disconnect the throttle position (TP) sensor and the idle air control (IAC) valve connectors.
  8. Disconnect the coolant hoses from the throttle body.
  9. Remove the throttle body retaining nuts.
    10. Fig 3: View Of Throttle Body And Electronic Throttle Control (ETC) Connector
    GM1256156Courtesy of GENERAL MOTORS CORP.
    NOTE: Mask off the ports to the intake manifold spacer. Failure to mask off the ports may allow foreign objects to enter the engine resulting in severe damage to the engine.
  10. Remove the throttle body and discard the gasket.
  11. Remove the TP sensor. Refer to Throttle Position Sensor Replacement .
  12. Remove the IAC valve. Refer to Idle Air Control Valve Replacement .
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