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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROL SYSTEM - 4.8L, 5.3L, AND 6.0L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSIDLE AIR CONTROL (IAC) VALVE REPLACEMENTREMOVAL PROCEDURE
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Removal Procedure

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Removal Procedure
WARNING: This page is about a different variant/trim than selected.
  1. Remove the generator. Refer to Generator Replacement 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.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.