GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Idle Air Control Valve Replacement

Removal Procedure
  1. Remove the rear seat cushion. Refer to Rear Seat Cushion Replacement in Seats.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.

    3. Object Number: 475295 Size: SH
  3. Remove the nuts (2) from the intake manifold sight shield (1).

    4. Object Number: 574138 Size: SH
  4. Remove the electrical connector (1) from the idle air control valve (4).

    5. Object Number: 596334 Size: SH
  5. Remove the idle air control valve attaching screws (2) from the idle air control valve (1).

    6. Object Number: 481091 Size: SH
  6. Remove the idle air control valve from the throttle body.
  7. Remove the idle air control valve O-ring.

Installation Procedure

    Object Number: 481091 Size: SH
  1. Install the new idle air control O-ring on the valve.

    2. Object Number: 596334 Size: SH
  2. Install the idle air control valve (1) into the throttle body.

    3. 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.

  3. Install the idle air control valve attaching screws (2).

    4. Tighten
    Tighten the idle air control valve attaching screws to 3.0 N·m (27 lb in).


    Object Number: 574138 Size: SH
  4. Install the electrical connector (1) into the idle air control valve (4).
  5. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  6. Install the rear seat cushion. Refer to Rear Seat Cushion Replacement in Seats.

    7. Object Number: 475295 Size: SH
  7. Install the intake manifold sight shield (1) to the engine.
  8. Install the intake manifold sight shield nuts (2) to the intake manifold sight shield (1).

    9. Tighten
    Tighten the intake manifold sight shield nuts to 3 N·m (27 lb in).

  9. Perform the IAC Valve learn procedure.
    10. 9.1. Start and idle the engine for 15 seconds.
    9.2. Turn the ignition switch to the LOCK/OFF position.
    9.3. Wait 15 seconds.
    9.4. Restart the engine , and check for proper idle operation.