Spark Plug: Installation: 4.0L

Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.

Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap or a cracked porcelain insulator.

1. Start the spark plug into the cylinder head by hand to avoid cross threading.
2. Tighten spark plugs. See SPECIFICATIONS - TORQUE - IGNITION SYSTEM .
3. Install coil rail. See COIL RAIL - 4.0L .