LaCrosse 2006-2007

Spark Plug Wires

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Inspection & Testing



Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation.

  1. Inspect for correct routing of the spark plug wires. Improper routing may cause cross-firing.
  2.  
  3. Inspect each wire for any signs of cracks or splits in the wire.
  4.  
  5. Inspect each boot for the following conditions:

    Tearing
     
    Piercing
     
    Arcing
     
    Carbon tracking
     
    Corroded terminal end
     

  6.  
  7. If corrosion, carbon tracking, or arcing are indicated on a spark plug wire boot or terminal, both the wire and the component connected to the wire should be replaced.
  8.  

Removal & Installation



3.8L Engine


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Fig. Remove the fuel injector sight shield-3.8L Engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the fuel injector sight shield:
    NOTE
    Clean the area around the oil fill cap in order to prevent contaminants from falling into the valve cover opening.

    1. Twist counterclockwise to unlock the oil fill tube (3) from the valve cover.
    2.  
    3. Lift and remove the fuel injector sight shield (1).
    4.  
    5. Install the oil fill tube (3) and the oil fill cap (2) onto the valve cover opening.
    6.  

  4.  
  5. Remove the spark plug wires from the spark plugs using the following steps:
    NOTE
    Note the position of the spark plug wires before removing the wires and place removed wires in cylinder order for ease of installation later.

    1. Twist the spark plug boot 1 / 2 turn before removing the boot.
    2.  
    3. Gently pry the heat shield up from spark plugs using the J 38491.
    4.  
    5. Remove the spark plug wire from the spark plug.
    6.  

  6.  
  7. Remove the spark plug wires from the ignition coils.
  8.  
  9. Remove the spark plug wire retaining clips from the rear, front and top of the engine.
  10.  
  11. Remove the spark plug wires from the engine.
  12.  

To install:

  1. When replacing the spark plug wires, transfer any of the following:

    Boot heat shields
     
    Spark plug wire conduit
     
    Spark plug wire retaining clips
     

  2.  
  3. Position the correct length of spark plug wire to each cylinder.
  4.  
  5. Install the spark plug wire retaining clips from the rear, front and top of the engine.
  6.  
  7. Install the spark plug wires to the ignition coil in the proper position.
  8.  
  9. Install the spark plug wires to the spark plugs.
  10.  
  11. Install the fuel injector sight shield:
    1. Remove the oil fill cap and the oil fill tube.
    2.  
    3. Insert the tab of the fuel injector sight shield under the fuel injector sight shield bracket.
    4.  
    5. Place the hole of the fuel injector sight shield onto the oil fill neck of the valve cover.
    6.  
    7. Install the oil fill tube and the oil fill cap.
    8.  

  12.  

 
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