Solstice 2006-2008, Sky 2007-2008

Spark Plugs

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Inspection & Gapping



Normal operation Brown to grayish tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.

Carbon Fouled Dry, fluffy black carbon, or soot caused by the following conditions:

  1. Inspect the insulator for flashover or carbon tracking, soot. This is caused by the electrical charge traveling across the insulator between the terminal no. post  and ground.
  2.  
  3. Inspect the insulator for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes.
  4.  
  5. Inspect for the following conditions:
    1. Rich fuel mixtures

      Leaking fuel injectors
       
      Excessive fuel pressure
       
      Restricted air filter element
       
      Incorrect combustion
       

    2.  
    3. Reduced ignition system voltage output

      Weak coils
       
      Worn ignition wires
       
      Incorrect spark plug gap
       

    4.  

  6.  
  7. Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
  8.  
  9. Deposit Fouling, Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery deposits will not affect spark intensity unless they form into a glazing over the electrode.
  10.  

Removal & Installation



2.4L (LE5) & 2.0L (LNF) Engines
  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the ignition coil electrical connectors.
  4.  
  5. Remove the ignition coil bolts.
  6.  
  7. Remove the ignition coils.
    WARNING
    Make sure that any water and/or debris is blown out of the spark plug holes prior to removing the spark plugs.

  8.  
  9. Remove the spark plugs using a 5 / 8  inch spark plug socket.

    Click image to see an enlarged view

    Fig. Ignition coils removed

  10.  

To install:


NOTE
Do not coat spark plug threads with anti-seize compound. If anti-seize compound is used and spark plugs are over-torqued, damage to the cylinder head threads may result.

  1. Check that the spark plug gap is 0.042 inch. (1.06 mm).
  2.  
  3. Install the spark plugs.
  4.  
  5. Tighten the plugs to 15 ft. lbs. (20 Nm).
  6.  
  7. Apply dielectric compound to the spark plug boots and make sure no corrosion is present.
  8.  
  9. Install the ignition coils.
  10.  
  11. Install the ignition coil bolts and tighten to 89 inch. lbs. (10 Nm).
  12.  
  13. Connect the ignition coil electrical connectors.
  14.  
  15. Install the intake manifold cover.
  16.  

 
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