GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Idle Air Control Valve Replacement

Removal Procedure

    Object Number: 312513 Size: SH
  1. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  2. Disconnect the idle air control (IAC) valve electrical connector (2).

    3. Object Number: 12909 Size: SH
  3. Remove the IAC valve screws.

    4. Object Number: 12910 Size: SH
  4. Remove the IAC valve and O-ring seal.

Cleaning and Inspection Procedure

Clean the IAC valve O-ring sealing surface, pintle valve seat, and air passage.

    • Remove any excess carbon deposits with a small amount of carburetor cleaner on a parts cleaning brush. Follow any instructions on the cleaner container regarding cleaner usage.
    • Do not use a cleaner containing an extremely powerful solvent such as methyl ethyl ketone.
    • Shiny spots on the pintle and seat do not represent a bent or misaligned pintle shaft.
    • If heavy deposits are present in the air passage, remove the throttle body for a complete cleaning. Refer to Throttle Body Cleaning .

Installation Procedure

    Object Number: 17065 Size: SH
  1. If installing a NEW IAC valve, measure the distance between the IAC valve pintle and the mounting flange. If the distance is more than 28 mm (1.10 in), use finger pressure, and gently push in the pintle.

    2. Object Number: 12910 Size: SH
  2. Install a NEW IAC valve O-ring seal.
  3. Lubricate the IAC valve O-ring seal with clean engine oil.
  4. Install the IAC valve and O-ring seal.

    5. Object Number: 12909 Size: SH
  5. If installing the old IAC valve, clean the old thread locking material from the screws.
  6. If installing the old IAC valve coat the screw threads with threadlock GM P/N 12345382 (Canadian P/N  10953489), or equivalent.

    7. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the IAC valve screws.

    8. Tighten
    Tighten the screws to 3 N·m (27 lb in).


    Object Number: 782174 Size: SH
  8. Connect the IAC valve electrical connector (2).
  9. Install the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  10. Perform the IAC reset procedure:
    11. 10.1. Turn the ignition to the ON position, wait for 5 seconds.
    10.2. Turn the ignition to the OFF position, wait for 10 seconds.
    10.3. Start the engine and check for proper idle speed.