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Intake Air Control Valve: Installation

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2000 Lexus SC 400, 2000 Lexus SC 300, 2000 Lexus RX 300, 2000 Lexus LX 470, and 2000 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.

To install, reverse removal procedure using NEW IAC valve gasket. Apply Seal Packing (08826-00080) at designated areas of IAC valve. See Fig 2. Apply a light coat of engine oil at rubber area on IAC valve before installing. Tighten nuts to specification. See TORQUE SPECIFICATIONS .

Fig 1: Removing No. 2 Intake Air Control Valve (ES300 & RX300)
G99D50552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying Seal Packing Application Areas & Rubber Area On Intake Air Control Valve (ES300 & RX300)
G99F50554Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002


To install reverse removal procedure. Tighten all bolts and nuts to specification. See TORQUE SPECIFICATIONS .



  1. To install, reverse removal procedure. Install NEW IAC valve actuator gasket. Slightly rotate actuator lever clockwise. See Fig 2. Connect actuator and air control valve levers. Install IAC valve.
  2. Install NEW intake manifold gaskets with White mark facing upward. Marks are painted on outer tabs of gasket. Ensure longer intake manifold bolts are installed in proper location. See Fig 3. Ensure to route IAC valve actuator vacuum hose under rear fuel line when reconnecting. Tighten all nuts/bolts to specification. See TORQUE SPECIFICATIONS .
Fig 1: Identifying Intake Air Control Valve (GS400 Shown; LS400 & SC400 Are Similar)
G99A52720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Installing Air Control Valve Actuator Lever (GS400, LS400 & SC400)
G98B10406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Installing Intake Manifold Bolts (GS400, LS400 & SC400)
G98C10407Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002


  1. To install, reverse removal procedure. Install NEW IAC valve actuator gasket. Slightly rotate actuator lever clockwise. See Figure. Connect actuator and air control valve levers. Install IAC valve.
  2. Install NEW intake manifold gaskets with White mark facing upward. Marks are painted on outer tabs of gasket. Ensure longer intake manifold bolts are installed in proper location. See Figure. Ensure to route IAC valve actuator vacuum hose under rear fuel line when reconnecting. Tighten all nuts/bolts to specification. See TORQUE SPECIFICATIONS .


To install, reverse removal procedure. Install NEW A/T oil dipstick and guide "O" ring. Install NEW brake booster union and air intake chamber gaskets. Tighten all bolts and nuts to specification. See TORQUE SPECIFICATIONS .



  1. To install, reverse removal procedure. Install NEW IAC valve actuator gasket. Slightly rotate actuator lever clockwise. See Figure. Connect actuator and air control valve levers. Install IAC valve.
  2. Install NEW intake manifold gaskets with White mark facing upward. Marks are painted on outer tabs of gasket. Ensure longer intake manifold bolts are installed in proper location. See Figure. Ensure to route IAC valve actuator vacuum hose under rear fuel line when reconnecting. Tighten all nuts/bolts to specification. See TORQUE SPECIFICATIONS .
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