Mazda Tribute 2001-06

Spark Plugs

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Inspection



Inspect the spark plug for the following:

  1. Bridged gap.

    Check for deposit build-up closing the gap between the electrodes. Deposits are caused by oil or carbon fouling. Clean the spark plug.
     

  2.  
  3. Check for oil fouling.

    Check for wet, black deposits on the insulator shell bore electrodes, caused by excessive oil entering the combustion chamber through worn rings and pistons, excessive valve-to-guide clearance or worn or loose bearings.
     
    Correct the oil leak concern.
     
    Install a new spark plug.
     

  4.  
  5. Carbon fouling.

    Look for black, dry, fluffy carbon deposits on the insulator tips, exposed shell surfaces and electrodes, caused by a spark plug with an incorrect heat range, dirty air cleaner, too rich a fuel mixture or excessive idling.
     
    Install new spark plugs.
     

  6.  
  7. Inspect for normal burning.

    Check for light tan or gray deposits on the firing tip.
     

  8.  
  9. Inspect for pre-ignition, identified by melted electrodes and a possibly damaged insulator. Metallic deposits on the insulator indicate engine damage. This may be caused by incorrect ignition timing, wrong type of fuel or the unauthorized installation of a heli-coil insert in place of the spark plug threads. Install a new spark plug.
  10.  
  11. Inspect for overheating, identified by a white or light gray spots and with bluish-burnt appearance of electrodes. This is caused by engine overheating, wrong type of fuel, loose spark plugs, spark plugs with an incorrect heat range, low fuel pump pressure or incorrect ignition timing. Install a new spark plug.
  12.  
  13. Inspect for fused deposits, identified by melted or spotty deposits resembling bubbles or blisters. These are caused by sudden acceleration. Install a new spark plug.
  14.  

Removal & Installation



2.0L Engine

CAUTION
Do not pull on the ignition wire directly, as the wire may separate from the connector inside the spark plug boot.


NOTE
If an original spark plug is reused, install it in the same cylinder from which it was removed. New spark plugs can be used in any cylinder.


NOTE
Use compressed air to remove any foreign material from the spark plug well before removing the spark plugs.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove or disconnect the following:

    Grasping the spark plug boot firmly and with a twisting-pulling motion, the ignition wires from the spark plugs.
     
    Spark plugs with spark plug wrench tool.
     

  4.  
  5. Inspect spark plugs.
  6.  
  7. Clean the spark plugs with a wire brush or a professional spark plug cleaner. To install:
  8.  

Measuring spark plug gap



Click image to see an enlarged view

Fig.

  1. Adjust the plug gap as necessary.
    NOTE
    Apply Anti-Seize Lubricant to the lower three threads of the spark plugs. Do not allow lubricant to contaminate the spark plug electrodes or insulator tips.

  2.  

Installing and tightening spark plugs to specification



Click image to see an enlarged view

Fig.

  1. Install the spark plugs. Tighten spark plugs to 15 ft. lbs. (11 Nm).
    NOTE
    Before installing the ignition wires, inspect the ignition wires for any visible damage. Install new ignition wires if necessary.

  2.  
  3. Connect the spark plug wires to the correct spark plugs.
  4.  

2.3L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Use compressed air to remove any foreign material in the spark plug well before removing the spark plugs.



    4 ignition coil-on-plug electrical connectors.
     
    4 ignition coil-to-valve cover bolts.
     
    4 ignition coils.
     



    Remove the 4 spark plugs.
     

  4.  
  5. Inspect the spark plugs. Replace as necessary.
  6.  
  7. Apply a small amount of dielectric grease to the inside of the ignition coil boots before attaching to the spark plugs.
  8.  
  9. To install, reverse removal procedure.
  10.  

3.0L Engine
  1. Disconnect the negative battery cable.
    CAUTION
    If removing the right hand side spark plugs, remove the upper intake manifold.

  2.  
  3. Remove or disconnect the following:

    Ignition coil-on-plugs.
     
    Electrical connector.
     
    Bolt and coil-on-plug.
     

  4.  

Removing spark plugs. Left hand side shown, right hand side similar



Click image to see an enlarged view

Fig.

  1. Remove spark plugs and inspect.
  2.  
  3. To install, reverse removal procedure.
  4.  

  1. Disconnect the negative battery cable.
    NOTE
    If removing the right hand coil-on-plug, remove the upper intake manifold.

  2.  
  3. Remove or disconnect the following:
    NOTE
    Use compressed air to remove any foreign material in the spark plug well before removing the spark plugs.



    6 ignition coil-on-plug electrical connectors.
     
    6 ignition coil-to-valve cover bolts.
     
    6 ignition coils.
     



    Remove the 6 spark plugs.
     

  4.  
  5. Inspect the spark plugs. Replace as necessary.
  6.  
  7. Apply a small amount of dielectric grease to the inside of the ignition coil boots before attaching to the spark plugs.
  8.  
  9. To install, reverse removal procedure.
  10.  

 
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