2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Intake Manifold: Reassembly

  1. INSTALL VACUUM SWITCHING VALVE ASSEMBLY (for ACIS) 
    1. Install the VSV to the vacuum tank with the screw.

      Torque: 1.4 N*m (14 kgf*cm, 12 in.*lbf) 

      Fig 1: Identifying VSV To Vacuum Tank With Screw
      G05289278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSTALL INTAKE AIR CONTROL VALVE ASSEMBLY 
    1. Install the valve with the 6 bolts.

      Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) 

      Fig 2: Identifying Valve With Bolts
      G05289279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL INTAKE MANIFOLD SUB-ASSEMBLY UPPER 
    1. Install a new gasket and the manifold upper to the manifold lower with the 14 bolts and 6 nuts.

      Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf) 

      Fig 3: Identifying Manifold Lower With Bolts And Nuts
      G05289280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSTALL INTAKE AIR CONTROL VALVE ACTUATOR 

    HINT:

    Before installing the actuator, adjust the intake air control valve to the fully closed position.

    1. Install a new gasket and the actuator with the 3 nuts.

      Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) 

      Fig 4: Identifying Intake Air Control Valve Actuator Nuts
      G05289281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSTALL VACUUM CONTROL VALVE SET 
    1. Install the vacuum control valve set with the 2 nuts.

      Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf) 

    2. Connect the 2 vacuum hoses to the manifold and clamp.
    3. Connect the VSV connector (for ACIS).
    4. Install the harness clamp to the manifold with the bolt.

      Torque: 7.5 N*m (76 kgf*cm, 66 in.*lbf) 

      Fig 5: Identifying Harness Clamp To Manifold With Bolt
      G05289282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Connect the vacuum hose to the air control valve actuator.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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