GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Jimmy - 4WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Idle Air Control Valve Replacement

Removal Procedure
  1. Turn OFF the ignition.
  2. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .

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

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

    5. Object Number: 12910 Size: SH
  5. Remove the IAC valve and O-ring from the throttle body assembly.

Cleaning and Inspection Procedure
  1. Clean the IAC valve O-ring sealing surface, pintle valve seat, and air passage.
    2. • Remove 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 methl 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 Assembly Replacement .

    Important:  DO NOT reuse the original O-ring.

  2. Replace the IAC valve O-ring.

Installation Procedure

    Object Number: 17065 Size: SH

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

  1. On a new IAC valve, 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 (1-1/8 in).

    2. Object Number: 12910 Size: SH
  2. Lubricate the IAC valve O-ring with clean engine oil.
  3. Align the flange holes with the mounting holes on the throttle body assembly.
  4. Insert the IAC valve through the O-ring into the throttle body assembly.

    5. 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.

    Important: The screws used to attach the IAC valve are coated with thread locking adhesive. Clean the attaching screw threads and apply thread locking material GM P/N 1052624 or equivalent.

  5. Install the IAC valve mounting screws.

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


    Object Number: 312513 Size: SH
  6. Connect the IAC valve harness connector.

    7. Object Number: 424556 Size: SH
  7. Install the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement .
  8. Perform the IAC Reset procedure:
    9. 8.1. Turn ON the ignition, with the engine OFF, for 5 seconds.
    8.2. Turn OFF the ignition for 10 seconds.
    8.3. Start the engine and check for proper idle speed.