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Home >> Chevrolet >> 2005 >> Chevy Express G2500, Van Cargo Extended, 4.3 X, 4L60E/M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.3L - Introduction >> Repair Instructions >> Idle Air Control (IAC) Valve Replacement >> Installation Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Installation Procedure

    Fig 1: View Of IAC Valve & O-Ring Seal
    GM12910Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If you are installing a new IAC valve, replace the valve with an identical part. The IAC valve pintle shape and diameter are designed for the specific application.
  1. Measure the distance between tip of the IAC valve pintle and the mounting flange.

    If the distance is more than 28 mm (1.10 in), use finger pressure in order to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause damage to the valve.

  2. Lubricate the IAC valve O-ring with clean engine oil.
  3. Install the IAC valve assembly.
    4. Fig 2: View Of IAC Valve Screws
    GM12909Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Install the attaching fasteners.

    Tighten:  Tighten the IAC valve fasteners to 3 N.m (27 lb in).

    5. Fig 3: View Of Idle Air Control (IAC) Valve Wiring Harness Connector
    GM12886Courtesy of GENERAL MOTORS CORP.
  5. Connect the IAC harness connector.
  6. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  7. Reset the IAC valve pintle position.
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