Spark Plug: Service and Repair: Service Precautions

SERVICE PRECAUTIONS
1. Twist ignition cable boots one-half turn before removing.
2. When removing the boot, do not use pliers or other tools that could tear the boot.
3. Do not force anything between the ignition cable and the boot, or through the silicone jacket of the wiring.
4. Do not pull on the ignition cables to remove the boot. Pull on the boot or use a tool designed for this purpose.
5. Special care should be exercised when installing spark plug boots to ensure the metal terminal within the boot is fully seated on the spark plug terminal and the boot has not moved on the ignition cable.
6. Any time the ignition cables or boots are installed on the spark plugs, new dielectric grease needs to be applied inside the boot.

NOTE: If boot to ignition cable movement has occurred, the boot will give a false visual impression of being fully seated. Make sure that boots have been properly assembled by pushing sideways on the installed boots. If they have been correctly installed, a stiff boot with only slight looseness will be noted. if the terminal has not been properly seated on the spark plug, only the resistance of the boot will be felt when pushing sideways.
Failure to properly seat the terminal onto the spark plug will lead to ignition cable core erosion and result in an engine misfire or crossfire condition, and possible internal damage to the engine.