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Home >> Chevrolet >> 2004 >> Optra Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC - Repair Instructions >> Repair Instructions >> Idle Air Control Valve Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: View Of IAC Valve And Bolts
    GM1241933Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If installing a new IAC valve, be sure to replace it with an identical part. The IAC valve pintle shape and diameter are designed for the specific application. Measure the distance between the tip of the IAC valve pintle and the mounting flange. If the distance is greater than 28 mm (1.1 in), use finger pressure to slowly retract the pintle.
    The force required to retract the pintle will not damage the IAC valve. The purpose of the 28 mm (1.1 in) setting is to prevent the IAC pintle from bottoming out on the pintle seat. This 28 mm (1.1 in) setting is also an adequate setting for controlled idle on a restart.
  1. Lubricate a new O-ring with engine oil. Install the new O-ring onto the valve.
  2. Install the IAC valve into the throttle body.
    3. Fig 2: View Of Idle Air Control Valve
    GM1241932Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  3. Install the IAC valve retaining bolts.

    Tighten:  Tighten the idle air control valve retaining bolts to 3 N.m (27 lb in)  .

  4. Connect the IAC valve connector.
  5. Connect the negative battery cable.
  6. Start the engine and check for the proper idle speed.
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