2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Throttle Body: Removal

  1. REMOVE ENGINE UNDER COVER 
  2. DRAIN ENGINE COOLANT  (See COOLANT )
  3. REMOVE V-BANK COVER SUB-ASSEMBLY  (See REMOVAL )
  4. REMOVE AIR CLEANER CAP SUB-ASSEMBLY 
    1. Loosen the 2 hose clamps and separate the 2 ventilation hoses
      Fig 1: Locating Ventilation Hoses And Hose Clamps
      G05751890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the mass air flow meter connector and separate the wire harness clamp.
      Fig 2: Locating Mass Air Flow Meter Connector And Wire Harness Clamp
      G05751891Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Loosen the hose clamp and separate the air cleaner hose.
      Fig 3: Locating Air Cleaner Hose Clamp
      G05751892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Unlock the 2 clamps and remove the air cleaner cap sub-assembly.
      Fig 4: Locating Air Cleaner Cap Sub-Assembly Clamps
      G05751893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE THROTTLE BODY ASSEMBLY 
    1. Disconnect the throttle body connector.
      Fig 5: Locating Throttle Body Connector
      G05751894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Loosen the hose clamp and separate the No. 5 water by-pass hose
      Fig 6: Locating Hose Clamp
      G05751895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Loosen the hose clamp and separate the No. 4 water by-pass hose.
      Fig 7: Locating Hose Clamp
      G05751896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 bolts and 2 nuts
      Fig 8: Locating Throttle Body Assembly Bolts And Nuts
      G05751897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using a "TORX" socket E6, remove the 2 stud bolts and throttle body assembly.
      NOTE: Do not damage the water hoses when removing the throttle body assembly.
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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