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(3) Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. If (4) Except 4.7L: Always remove spark plug or igni- tion coil cables by grasping at the cable boot (Fig. (5) Inspect spark plug condition. Refer to Spark Plug Conditions. CLEANING The plugs may be cleaned using commercially available spark plug cleaning equipment. After clean- CAUTION: Never use a motorized wire wheel brush GAP ADJUSTMENT Check the spark plug gap with a gap gauge tool. If the gap is not correct, adjust it by bending the INSTALLATION CAUTION: The 4.7L V–8 engine is equipped with Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a Except 4.7L Engine: When replacing the spark plug and ignition coil cables, route the cables cor- (1) Start the spark plug into the cylinder head by hand to avoid cross threading. (2) Except 4.7L Engine: Tighten spark plugs to 35-41 N·m (26-30 ft. lbs.) torque. (3) Except 4.7L Engine: Install spark plug cables over spark plugs. (4) 4.7L V–8 Engine: Tighten spark plugs to 27 N·m (20 ft. lbs.) torque. (5) 4.7L V–8 Engine: Before installing coil(s), check condition of coil o-ring and replace as neces- (6) 4.7L V–8 Engine: Install ignition coil(s). Refer to Ignition Coil Removal/Installation. IGNITION COIL—3.9/5.2/5.9L ENGINES The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type. REMOVAL The coil is mounted to a bracket that is bolted to the front of the right engine cylinder head (Fig. 24). (1) Disconnect the primary wiring from the igni- tion coil. (2) Disconnect the secondary spark plug cable from the ignition coil. Fig. 23 Setting Spark Plug Gap—Typical 1 – GAUGE 8D - 12 IGNITION SYSTEM DN REMOVAL AND INSTALLATION (Continued) |