2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Knock Sensor, Intake Manifold: Installation

  1. INSTALL KNOCK SENSOR 
    1. Install the 2 knock sensors with the 2 nuts as shown in the illustration.

      Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) 

    2. Connect the 2 knock sensor connectors.
  2. INSTALL AIR PUMP ASSEMBLY WITH BRACKET  (See INSTALLATION )
    Fig 1: Locating Knock Sensors And Nuts
    G04968239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL INTAKE MANIFOLD 
    1. Place 2 new gaskets on the intake manifold.
      Fig 2: Identifying Gaskets On Intake Manifold
      G04968240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Place the intake manifold on the cylinder heads.
    3. Install and uniformly tighten the 6 bolts and 4 nuts in several steps.

      Torque: 18 N*m (185 kgf*cm, 13 ft.*lbf) 

      Fig 3: Locating Intake Manifold Bolts And Nuts
      G04968241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Install the V-bank cover bracket to the intake manifold.

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

    5. Install the wire bracket to the intake manifold with the bolt.

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

    6. Connect the engine wire to the engine hanger and wire bracket.
      Fig 4: Locating Wire Bracket Bolt
      G04968242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Connect the wire protector to the intake manifold and cylinder heads with the bolt and nut.
    8. Install the 2 ground cables with the 2 bolts to the RH and LH cylinder heads.
      Fig 5: Locating Cylinder Heads Bolts
      G04968234Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Connect the 2 water by-pass hoses to the throttle body.
      Fig 6: Locating Water By-Pass Hoses
      G04968244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Connect the 2 wire clamps to the wire clamp bracket on the RH delivery pipe.
      Fig 7: Locating Wire Clamps
      G05843826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CONNECT HOSES FORM INTAKE MANIFOLD 
    1. Connect the vacuum hose [A] to the fuel pressure regulator.
    2. Connect the PCV hose [B] to the PCV valve on the LH cylinder head.
    3. Connect the EVAP hose (from the charcoal canister) [C] to the purge VSV.
    4. Connect the 2 vacuum hoses [D] to the VSV for the air injection system.
  5. CONNECT CONNECTORS FROM INTAKE MANIFOLD 
    1. Connect the throttle control connector.
    2. Connect the 2 VSV connectors for the air injection system.
    3. Connect the purge VSV connector.
    4. Connect the 8 injector connectors.
    5. Connect the ECT sensor connector.
    6. Connect the 8 ignition coil connectors.
    7. Connect the 2 air fuel ratio sensor connectors.
      Fig 8: Identifying Vacuum Hose, PCV Hose, EVAP Hose And Vacuum Hoses
      G05843827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSTALL FUEL HOSE NO.2 
  7. INSTALL FUEL HOSE  (See INSTALLATION )
  8. INSTALL V-BANK COVER SUB-ASSEMBLY  (See INSTALLATION )
  9. ADD ENGINE COOLANT  (See REPLACEMENT )
  10. CHECK FOR ENGINE COOLANT LEAKS  (See ON-VEHICLE INSPECTION )
  11. CHECK FOR FUEL LEAKS  (See ON-VEHICLE INSPECTION )
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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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