Tucson 2006-2008

Spark Plugs

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Inspection



Check the plugs for deposits and wear. If they are not going to be replaced, clean the plugs thoroughly. Remember that any kind of deposit will decrease the efficiency of the plug. Plugs can be cleaned on a spark plug cleaning machine, which can sometimes be found in service stations, or you can do an acceptable job of cleaning with a stiff brush. If the plugs are cleaned, the electrodes must be filed flat. Use an ignition points file, not an emery board or the like, which will leave deposits. The electrodes must be filed perfectly flat with sharp edges; rounded edges reduce the spark plug voltage by as much as 50 percent.

Check spark plug gap before installation. The ground electrode (the L-shaped one connected to the body of the plug) must be parallel to the center electrode and the specified size wire gauge (please refer to the Tune-Up Specifications chart for details) must pass between the electrodes with a slight drag.


NOTE
NEVER adjust the gap on a used platinum type spark plug.

Always check the gap on new plugs as they are not always set correctly at the factory. Do not use a flat feeler gauge when measuring the gap on a used plug, because the reading may be inaccurate. A round-wire type gapping tool is the best way to check the gap. The correct gauge should pass through the electrode gap with a slight drag. If you're in doubt, try one size smaller and one larger. The smaller gauge should go through easily, while the larger one shouldn't go through at all. Wire gapping tools usually have a bending tool attached. Use that to adjust the side electrode until the proper distance is obtained. Absolutely never attempt to bend the center electrode. Also, be careful not to bend the side electrode too far or too often as it may weaken and break off within the engine, requiring removal of the cylinder head to retrieve it.

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Fig. "a1p40"" Inspect the spark plug to determine engine running conditions



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Fig. "S212"" A variety of tools and gauges are needed for spark plug service



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Fig. "S903"" Checking the spark plug gap with a feeler gauge



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Fig. "S904"" Adjusting the spark plug gap



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Fig. "S141"" If the standard plug is in good condition, the electrode may be filed flat-WARNING: do not file platinum plugs

Removal & Installation



2.0L Engine

Specific to:

Hyundai Tucson 2006-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the spark plug cables.
    WARNING
    When removing the spark plug cable, pull on the spark plug cable boot (not the cable), as it may be damaged.

  4.  
  5. Using a spark plug socket, remove the spark plugs.
    WARNING
    Be careful that no contaminants enter through the spark plug holes.

  6.  
  7. Check the electrode gap of the new spark plugs. Specification: 0.039-0.043 inch (1.0-1.1mm).
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the spark plugs to 15-22 ft. lbs. (20-30 Nm).
  4.  

2.7L Engine

Specific to:

Hyundai Tucson 2006-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the engine cover.
  4.  
  5. Disconnect the Variable Intake System (VIS) actuator connectors and the fuel injector connectors.
  6.  
  7. Remove the accelerator cable.
  8.  
  9. Remove surge tank sub assembly.
  10.  
  11. Remove the spark plug cable.
  12.  
  13. Remove the spark plug.
  14.  
  15. Check the electrode gap of the new spark plugs. Specification: 0.039-0.043 inch (1.0-1.1mm).
  16.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the spark plugs to 15-22 ft. lbs. (20-30 Nm).
  4.  

 
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