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Home >> Chevrolet >> 2005 >> Chevy Express G2500, Van Cargo Extended, 6.0 U >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.8L, 5.3L, And 6.0L - Introduction >> Repair Instructions >> Idle Air Control (IAC) Valve Replacement >> Removal Procedure

Removal Procedure

  1. Remove the generator. Refer to Generator Replacement (4.8L, 5.3L, and 6.0L) in Engine Electrical.
    2. Fig 1: View Of TP Sensor & IAC Valve Electrical Connectors
    GM389028Courtesy of GENERAL MOTORS CORP.
  2. Disconnect the idle air control (IAC) valve electrical connector.
    3. Fig 2: View Of TP Sensor, IAC Valve & Components
    GM356448Courtesy of GENERAL MOTORS CORP.
  3. Remove the IAC valve attaching screws (4).
  4. Remove the IAC valve (3).
  5. Remove the IAC valve O-ring seal (2).
    6. NOTE:
    • Do Not push or pull on the IAC valve pintle on IAC valves that have been in service. The force required to move the pintle may damage the threads on the worm drive.
    • Do Not soak the IAC valve in any liquid cleaner or solvent, as damage may result.
  6. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
    • Clean the IAC valve using GM cleaner P/N 1052626 or GM X-66A. Use a shop towel or parts brush to remove heavy deposits.
    • If the air passage has heavy deposits, remove the throttle body for complete cleaning.
    • Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
  7. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if the O-ring is damaged.
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