Cable-Spark Plug: Removal
5.7L V-8
Spark plug cables on the 5.7L engine are paired on cylinders 1/6, 2/3, 4/7 and 5/8. Before removing or disconnecting any spark plug cables, note their original position. Remove cables one-at-a-time. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position. The cable retention clips (6) and (8) must also be securely locked.
Before installing spark plug cables to either the spark plugs or coils, apply dielectric grease to inside of boots.
If cable tray removal is necessary, release the 4 tray-to-manifold retention clips.