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    1998 Honda Civic EX 1.6L MFI VTEC SOHC 4cyl

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    Rendezvous 2006-2007

    Spark Plugs

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    Inspection



    1. Inspect the terminal post for damage

      Inspect for a bent or broken terminal post
       
      Test for a loose terminal post by twisting and pulling the post. The terminal post should NOT move.
       

    2.  
    3. Inspect the insulator for flashover or carbon tracking, soot. This is caused by the electrical charge traveling across the insulator between the terminal post and ground. Inspect for the following conditions:

      Inspect the spark plug boot for damage
       
      Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated causes arcing to ground.
       

    4.  
    5. Inspect the insulator for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes
    6.  
    7. Inspect for evidence of improper arcing
    8.  
    9. Measure the gap between the center electrode and the side electrode terminals. An excessively wide electrode gap can prevent correct spark plug operation.
    10.  
    11. Inspect for the correct spark plug torque. Insufficient torque can prevent correct spark plug operation. An over-torqued spark plug causes the insulator to crack.
    12.  
    13. Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode
    14.  
    15. Inspect for a broken or worn side electrode
    16.  
    17. Inspect for a broken, worn, or loose center electrode by shaking the spark plug.

      A rattling sound indicates internal damage
       
      A loose center electrode reduces the spark intensity.
       

    18.  
    19. Inspect for bridged electrodes. Deposits on the electrodes reduce or eliminates the gap.
    20.  
    21. Inspect for worn or missing platinum pads on the electrodes if equipped
    22.  
    23. Inspect for excess fouling
    24.  
    25. Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation
    26.  
    27. Normal operation--Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.
    28.  
    29. Carbon fouled--Dry, fluffy, black carbon, or soot caused by the following conditions:

      Rich fuel mixtures
       
      Leaking fuel injectors
       
      Excessive fuel pressure
       
      Restricted air filter element
       
      Incorrect combustion
       
      Reduced ignition system voltage output
       
      Weak coils
       
      Worn ignition wires
       
      Incorrect spark plug gap
       
      Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
       

    30.  
    31. Deposit fouling: Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery deposits will not effect spark intensity unless they form into a glazing over the electrode.
    32.  

    Removal & Installation



    3.4L & 3.5L Engines

    NOTE
    Observe the following service precautions:



    Allow the engine to cool before removing the spark plugs. Attempting to remove spark plugs from a hot engine can cause the spark plugs to seize. This can damage the cylinder head threads.
     
    Clean the spark plug recess area before removing the spark plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head, or in contamination of the cylinder head threads. Contaminated threads may prevent proper seating of the new spark plug.
     
    Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
     

    1. Turn the ignition OFF
    2.  
    3. For 3.5L engine, remove the intake manifold cover.
    4.  
    5. Remove the spark plug wire(s) (2, 4, and 6) from the left side spark plug(s).
    6.  
    7. Remove the air cleaner outlet duct.
    8.  
    9. Set the park brake.
    10.  
    11. Shift the transaxle into neutral (N).
    12.  
    13. Remove the left and right engine mount struts.
    14.  
    15. Install the J 41131 rotation tool.
    16.  
    17. Pull on the engine in order to rotate the engine forward.
    18.  
    19. Tighten the J 41131 tool.
    20.  
    21. Remove the spark plug wire(s) (1, 3, and/or 5) from the right side spark plug(s).
    22.  
    23. Remove the spark plug(s) from the cylinder head.
    24.  

    To install:


    NOTE
    It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.

    1. Gap the spark plugs to 0.60 inches (1.52mm).
      NOTE
      Be sure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.


      NOTE
      Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    2.  
    3. Install the spark plug(s).
    4.  
    5. If the spark plugs are installed into a new cylinder head, tighten the spark plugs to 15 lb-ft (20 Nm). If the spark plugs are installed into an existing cylinder head, tighten the spark plugs to 11 lb-ft (15 Nm).
    6.  
    7. Install the spark plug wire(s) (1, 3, and 5) to the right side spark plug(s).
    8.  
    9. Carefully release the tension on the J 41131 tool.
    10.  
    11. Remove the J 41131 tool.
    12.  
    13. Install the left and right engine mount struts.
    14.  
    15. Install the spark plug wire(s) (2, 4, and/or 6) from the left side spark plug(s).
    16.  
    17. For 3.5L engine, install the intake manifold cover.
    18.  

    3.6L Engine
    1. Turn the ignition OFF .
    2.  
    3. Remove the ignition coil.
      CAUTION
      Wear safety glasses when using compressed air in order to prevent eye injury.


      NOTE
      Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.

    4.  
    5. Use compressed air in order to remove debris from the spark plug cavity.
      NOTE
      Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

    6.  
    7. Remove the spark plug.
    8.  

    To install:


    NOTE
    Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.


    NOTE
    Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feelergauge to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.

    1. Gap the spark plugs to 0.044 inches (1.10 mm).
      NOTE
      Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.

    2.  
    3. Install the spark plugs.
    4.  
    5. Tighten the spark plugs to 15 ft. lbs. (20 Nm).
    6.  
    7. Install the ignition coil.
    8.  

     
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