Mitsubishi Endeavor 2004-06

Spark Plugs

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Inspection



The Endeavor models use iridium spark plugs. Be careful not to damage the iridium tips of the plugs. Do not adjust the spark plug gap. Spark plugs must spark properly to assure proper engine performance and reduce exhaust emission level. Therefore, they should be replaced periodically with new ones.


WARNING
Cleaning of the iridium plug may result in damage to the iridium tips. Therefore, if carbon deposits must be removed, use a plug cleaner and complete cleaning within 20 seconds to protect the electrode. Do not use a wire brush.

  1. Remove the spark plug(s).
    NOTE
    The replacement spark plugs for the Endeavor models are as follows: NGK: FR6EI, or DENSO K20PSR-B8.

  2.  
  3. Check, but do not adjust, the plugs to make sure they have the proper gap: 0.028-0.031 in. (0.7-0.8mm).

    Click image to see an enlarged view

    Fig. Do not damage the iridium tips of the spark plugs

  4.  
  5. Once the spark plugs is removed, you can test them, as follows:
    1. Remove the spark plug and connect to the ignition coil.

      Click image to see an enlarged view

      Fig. Remove the spark plug and connect to the ignition coil

    2.  
    3. Ground the spark plug outer electrode (body), and crank the engine. Check that there is an electrical discharge between the electrodes. If not, replace the plug.

      Click image to see an enlarged view

      Fig. Ground the spark plug outer electrode (body), and crank the engine. Check that there is an electrical discharge between the electrodes

    4.  

  6.  

Removal & Installation



The Endeavor models use iridium spark plugs. Be careful not to damage the iridium tips of the plugs. Do not adjust the spark plug gap. Spark plugs must spark properly to assure proper engine performance and reduce exhaust emission level. Therefore, they should be replaced periodically with new ones.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the ignition coil(s), as outlined in this section.
  4.  
  5. Remove the spark plug(s).
    NOTE
    The replacement spark plugs for the Endeavor models are as follows: NGK: FR6EI, or DENSO K20PSR-B8.

  6.  
  7. Check, but do not adjust, the plugs to make sure they have the proper gap: 0.028-0.031 in. (0.7-0.8mm).
  8.  
  9. Once the spark plugs is removed, you can test them, as follows:
    1. Remove the spark plug and connect to the ignition coil.

      Click image to see an enlarged view

      Fig. Remove the spark plug and connect to the ignition coil

    2.  
    3. Ground the spark plug outer electrode (body), and crank the engine. Check that there is an electrical discharge between the electrodes. If not, replace the plug.

      Click image to see an enlarged view

      Fig. Ground the spark plug outer electrode (body), and crank the engine. Check that there is an electrical discharge between the electrodes

    4.  

  10.  

To install:

  1. Install the spark plugs and tighten to 14-22 ft. lbs. (21-29 Nm).
  2.  
  3. Install the ignition coil(s), as outlined in this section.
  4.  
  5. Connect the negative battery cable. On 2005-2006 vehicles, turn the ignition ON and then OFF , and keep it off for at least ten seconds.
  6.  

 
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