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INSTALLATION - 3.9L/5.2L/5.9L The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type. (1) Install the ignition coil to coil bracket. If nuts and bolts are used to secure coil to coil bracket, (2) Connect all wiring to ignition coil. INSTALLATION - 4.7L (1) Using compressed air, blow out any dirt or con- taminants from around top of spark plug. (2) Check condition of coil o-ring and replace as necessary. To aid in coil installation, apply silicone to (3) Position ignition coil into cylinder head opening and push onto spark plug. Do this while guiding coil (4) Install mounting stud nut and tighten to 8 N·m (70 in. lbs.) torque. (5) Connect electrical connector to coil by snapping into position. (6) If necessary, install throttle body air tube or box. SPARK PLUG DESCRIPTION All engines use resistor type spark plugs. 4.7L V-8 engines are equipped with “fired in suppressor seal” Because of the use of an aluminum cylinder head on the 4.7L engine, spark plug torque is very critical. To prevent possible pre-ignition and/or mechanical engine damage, the correct type/heat range/number OPERATION Remove the spark plugs and examine them for burned electrodes and fouled, cracked or broken por- Spark plugs that have low mileage may be cleaned and reused if not otherwise defective, carbon or oil CAUTION: Never use a motorized wire wheel brush DIAGNOSIS AND TESTING - SPARK PLUG NORMAL OPERATING The few deposits present on the spark plug will probably be light tan or slightly gray in color. This is Fig. 27 Ignition Coil Location—4.7L V–8 Engine 1 - IGNITION COIL 8I - 16 IGNITION CONTROL AN IGNITION COIL (Continued) |