GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC K Sierra - 4WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Idle Air Control Valve Replacement

Removal Procedure

    Object Number: 312513 Size: SH
  1. Disconnect the idle air control (IAC) valve harness connector.

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

    3. Object Number: 12910 Size: SH

    Notice: If the IAC valve has been in service: DO NOT push or pull on the IAC valve pintle. The force required to move the pintle may damage the threads on the worm drive. Also, DO NOT soak the IAC valve in any liquid cleaner or solvent, as damage may result.

  3. Remove the IAC valve and O-ring seal from the throttle body assembly.

Cleaning and Inspection Procedure
  1. Clean the IAC valve using GM cleaner 1052626, GM X-66A, or the equivalent. Do not use a solvent containing an extremely powerful solvent such as methyl ethyl ketone. Use a shop towel or parts brush to remove heavy deposits.
  2. Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
  3. Inspect the IAC valve O-ring for cuts, cracks, or distortion. Replace the O-ring if it is damaged.
  4. Clean the IAC valve O-ring sealing surface, the pintle valve seat, and the air passage.
  5. Remove the throttle body for a complete cleaning if the air passage has heavy deposits. Refer to Throttle Body Assembly Replacement .

Installation Procedure

    Object Number: 17065 Size: SH

    Important: Use an identical part when installing a new IAC valve. The IAC valve pintle shape and dimensions are designed for specific applications.

  1. Measure the distance between the IAC valve pintle and mounting flange. Use finger pressure to slowly retract the pintle if the distance is more than 28 mm (1.1 in.).

    2. Object Number: 12910 Size: SH
  2. Lubricate the IAC valve O-ring with clean engine oil.
  3. Install the IAC valve O-ring on the IAC valve.
  4. Install the IAC valve.
  5. Align the IAC valve flange holes with the throttle body attaching screw holes.

    6. Object Number: 12909 Size: SH

    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.

  6. Install the IAC valve attaching screws.

    7. Tighten
    Tighten the IAC valve attaching screws to 3.1 N·m (26 lb in.).


    Object Number: 312513 Size: SH
  7. Connect the IAC valve harness connector.
  8. Reset the IAC valve pintle position.

IAC Valve Reset Procedure
  1. Turn ON the ignition for 20 seconds.
  2. Turn OFF the ignition for 10 seconds.
  3. Start the engine.
  4. Check for the proper idle speed.