I will attach instructions on how to change. If you still need help just reply, if not click ACCEPT when we are done.
On the 4.0L 6 - cylinder engine, the spark plugs are located below the coil rail assembly. On the 4.7L V - 8 engine, each individual spark plug is located under each ignition coil.
- 4.0L 6 - Cylinder Engine: Prior to removing spark plug, spray compressed air around spark plug hole and area around spark plug. This will help prevent foreign material from entering combustion chamber.
- 4.7L V - 8 Engine: Prior to removing spark plug, spray compressed air around base of ignition coil at cylinder head. This will help prevent foreign material from entering combustion chamber.
- On the 4.0L engine the coil rail assembly must be removed to gain access to any/all spark plug. Refer to Ignition Coil Removal/Installation. On the 4.7L V-8 engine each individual ignition coil must be removed to gain access to each spark plug. Refer to Ignition Coil Removal/Installation.
- Remove spark plug from cylinder head using a quality socket with a rubber or foam insert.
- Inspect spark plug condition. Refer to Spark Plug Conditions.
The plugs may be cleaned using commercially available spark plug cleaning equipment. After cleaning, file center electrode flat with a small point file or jewelers file before adjusting gap.
CAUTION: Never use a motorized wire wheel brush to clean spark plugs. Metallic deposits will remain on spark plug insulator and will cause plug misfire.
Check spark plug gap with a gap gauge tool. If the gap is not correct, adjust it by bending ground electrode (see picture)Never attempt to adjust gap by bending center electrode.
CAUTION: The 4.7L V - 8 engine is equipped with copper core ground electrode spark plugs. They must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, pre-ignition will result.
Special care should be taken when installing spark plugs into cylinder head spark plug wells. Be sure plugs do not drop into plug wells as ground straps may be bent resulting in a change in plug gap, or electrodes can be damaged.
Always tighten spark plugs to specified torque. Over tightening can cause distortion resulting in a change in spark plug gap or a cracked porcelain insulator.
- Start spark plug into cylinder head by hand to avoid cross threading.
- 4.0L 6 - Cylinder Engine: Tighten spark plugs to 35-41 N·m (26-30 ft. lbs.) torque.
- 4.7L V - 8 Engine: Tighten spark plugs to 27 N·m (20 ft. lbs.) torque.
- Install ignition coil(s) Refer to Ignition Coil Removal/Installation.