Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

Spark Plug Wires

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Inspection



Visually check the spark plug wires for burns cuts, or breaks in the insulation. Check the boots and the nipples on the distributor cap and/or coil. Replace any damaged wiring; cracked or shorted spark plug wires can short to ground, and cause a -miss- when the engine is running.

Measure the resistance of the spark plug wire using an ohmmeter. The wires should be between 397- and 1,337 ohms.

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Label each spark plug wire and make a note of its routing.
  4.  
  5. Twist, then pull the spark plug wire from the spark plug and then from the coil pack.
  6.  

To install:

  1. If replacing the spark plug wires, match the old wire with an appropriately sized wire in the new set.
  2.  
  3. Lubricate the boots and terminals with dielectric grease and install the wire on the coil pack. Make sure the wire snaps into place.
  4.  
  5. Route the wire in the exact path as the original and connect the wire to the spark plug.
  6.  
  7. Repeat the process for each remaining wire.
  8.  

 
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