Lexus RX400h, Hybrid 3 2006

Spark Plugs

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Inspection




WARNING
Do not use a wire brush for cleaning. Do not attempt to adjust the electrode gap of a used spark plug.

  1. Check the electrode, as follows:
    1. Using a megaohmmeter, measure the insulation resistance.
    2.  
    3. Correct insulation resistance is 10 m- or higher.
    4.  
    5. If the resistance is less then the specified value, proceed to the next step.
      NOTE
      If a megaohmmeter is not available, perform the following simple inspection instead.



      Click image to see an enlarged view

      Fig. Use a megaohmmeter to measure the resistance of the spark plug insulation

    6.  

  2.  
  3. Alternative inspection method:
    1. Quickly accelerate the engine to 4,000 rpm 5 times.
    2.  
    3. Remove the spark plug.
    4.  
    5. Visually check the spark plug.
    6.  
    7. If the spark plug is dry, reinstall the spark plug. If the spark plug is wet, go to the next step.
    8.  

  4.  
  5. Check the spark plug for any damage to its threads and insulator. If there is any damage, replace the spark plug. The recommended spark plug for these models is:
    1. Denso: SK20R11
    2.  
    3. NGK: IFR6A11
    4.  

  6.  
  7. Check the spark plug electrode gap. Maximum electrode gap for used spark plug is 1.3 mm (0.051 in.). If the gap is greater than the maximum, replace the spark plug. The correct electrode gap for new spark plug is 1.0 to 1.1 mm (0.039 to 0.043 in.).

    Click image to see an enlarged view

    Fig. Check, but do not adjust, the electrode gap

  8.  
  9. Clean the spark plugs. If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.
    NOTE
    If there are traces of oil, remove them with gasoline before using the spark plug cleaner.

  10.  

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the ignition coils, as outlined in this section.
  4.  
  5. Use a spark plug socket and wrench and remove the spark plugs.
  6.  
  7. Inspect the condition of the spark plugs, as outlined in this section.
  8.  

To install:

  1. Install the spark plugs and tighten to 18 ft. lbs. (25 Nm).
  2.  
  3. Install the ignition coils, as outlined in this section.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. If necessary, perform the initialization procedure, as outlined in the Chassis Electrical System.
  8.  

 
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