2004 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Ignition Coil: Removal

  1. REMOVE INTAKE AIR RESONATOR 
  2. REMOVE NO. 3 TIMING BELT COVER 

    Using a 5 mm hexagon wrench, remove the 4 bolts, oil filler cap and No.3 timing belt cover.

  3. DISCONNECT THROTTLE BODY FROM INTAKE AIR CONNECTOR WITHOUT DISCONNECTING WATER BYPASS HOSES 
    1. Disconnect the accelerator cable.
    2. Disconnect the throttle position sensor connector.
    3. Disconnect the throttle control motor connector.
    4. Disconnect the accelerator pedal position sensor connector.
    5. Disconnect the engine wire clamp from the clamp bracket of the throttle body.
    6. Remove the 2 bolts and nut holding the throttle body to the intake air connector.
      1. Torque: 21 N.m (210 kgf.cm, 15 ft.lbf) 
    7. Remove the 4 nuts and the throttle body bracket.
      1. Torque: 21 N.m (210 kgf.cm, 15 ft.lbf) 
      Fig 1: Removing Throttle Body Bracket
      G00892714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Disconnect the water bypass hose from the hose clamp on the oil filter bracket.
      Fig 2: Disconnecting Water Bypass Hose From Hose Clamp On Oil Filter Bracket
      G00892715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Slightly slide the throttle body away from the intake air connector.
  4. REMOVE THROTTLE BODY GASKET 

    Remove the 3 bolts and throttle body gasket.

    1. Torque: 21 N.m (210 kgf.cm, 15 ft.lbf) 
    Fig 3: Removing Throttle Body Gasket
    G00892716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE IGNITION COILS AND HIGH-TENSION CORDS SET ASSEMBLY 
    1. Disconnect the 3 connectors from the ignition coils.
    2. Remove the 2 bolts, and disconnect the clamps from the engine wire.
      Fig 4: Disconnecting Clamps From Engine Wire
      G00892717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the 3 bolts, the ignition coils and high-tension cord set assembly.
      1. Torque: 8.0 N.m (80 kgf.cm, 71 in..lbf) 
      Fig 5: Removing Ignition Coils And High-Tension Cord Set Assembly
      G00892718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE IGNITION COILS FROM HIGH-TENSION CORD SET 
    Fig 6: Removing Ignition Coils From High-Tension Cord Set
    G00892719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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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