Mercury F7PZ-12029-AA Coil Assembly - Ignition

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Before replacing ignition system components, check with your dealer service department to see if your vehicle qualifies for a Federally mandated extended warranty of 5 years or 50,000 miles. For vehicles with Electronic Engine Control (EEC), be aware that disconnecting the battery may cause the Powertrain Control Module (PCM) to lose its memory, resulting in abnormal driving symptoms for the first 10 miles or so until the PCM relearns its adaptive strategy.To replace the Duraspark ignition coil, disconnect the negative battery cable, mark the wires at the coil using coded tape, remove the coil-to-distributor high-tension lead, disconnect the connections at the coil, and remove the retaining bolts holding the coil bracket. Then, remove the coil from the bracket and install the new coil, applying a thin layer of silicone grease to the inside of the coil-to-distributor high-tension lead boot during reinstallation.For the Duraspark ignition module, detach the cable from the negative battery terminal, unplug the module connectors (depending on whether it's the standard or universal module), remove the mounting screws, and then install the new module.For the Duraspark stator assembly on V8 engines, remove the negative battery cable, distributor cap, rotor, distributor connector from the wiring harness, and cap adjuster. Use a gear puller to remove the armature from the sleeve and plate assembly, and then remove the E-clip retaining the diaphragm rod to the stator assembly. Remove the ground strap screw, wire retaining clip, and lift the stator assembly off the lower plate assembly. Clean the lower plate assembly if it will be reused and install the stator assembly, armature, and other components in reverse order.For V6 engines, the process is similar but includes additional steps to remove the lower plate assembly and stator assembly from the distributor base.To replace the TFI-IV ignition coil, locate the coil assembly, unplug the electrical connector and coil wire, remove the retaining screws, and detach the coil. Then, install the new coil, making sure to apply a thin coat of silicone dielectric grease to the inside of the coil-to-distributor high-tension lead boot.For the TFI-IV ignition control module (distributor-mounted or remote-mounted), follow the specified steps for removal and installation. Apply silicone dielectric grease to the back of the module before installing it.To replace the TFI-IV or DI distributor stator (PIP sensor), remove the distributor cap and wires, then follow the specific steps for removal and installation of the stator assembly, distributor shaft, and other components. Check for wear or damage and replace any faulty parts as needed.Make sure to follow the instructions carefully and ensure that the correct parts are used for each component replacement.

For installation, simply reverse the removal steps.

For breaker points type ignition systems, start by marking the wires and terminals with numbered tape. Then, remove the primary wires and high-tension wire from the coil. Take out the coil assembly and clean the outer case, checking for cracks or damage. Inspect the coil primary terminals and the coil tower terminal for corrosion, cleaning with a wire brush if necessary. Use an ohmmeter to check the coil primary resistance and compare it to the specifications. Do the same for the coil secondary resistance. If the resistances are not as specified, replace the coil. Keep all coil terminals and wire leads clean, tight, and dry. Install the coil back in its mount and reconnect the wires. For breakerless type ignition systems, check the primary and secondary coil resistance. Disconnect the wires from the coil and use an ohmmeter to measure the resistance across the coil primary terminals. The resistance should match the specifications. Then, connect the ohmmeter between the negative primary terminal and the secondary terminal and check the resistance. If the resistances are not as specified, replace the coil. Measure the resistance from the positive primary terminal to the case of the ignition coil. If the resistance is less than specified, replace the coil. Reconnect the ignition coil wires. For electronic distributorless ignition (EDIS) systems, start by disconnecting the electrical connector(s) from the coil. Use an ohmmeter to check the resistance between the coil primary terminal and the outer terminal. The resistance should match the specifications. Then, connect the ohmmeter between the secondary terminals of each coil pack and check the resistance. If the resistances are not as specified, replace the coil. To replace the coil, disconnect the negative cable from the battery and disconnect the ignition coil electrical connector(s) from each individual coil pack. Disconnect the ignition wires and remove the bolts securing the ignition coil to the mounting bracket. Install the new coil, making sure to coat the interior of the rubber boot with silicone dielectric compound and properly insert each spark plug wire into the corresponding terminal.

To replace the coil in the EDIS system, start by disconnecting the negative cable from the battery. Then, disconnect the ignition coil electrical connectors from each individual coil pack and disconnect the ignition wires. Remove the bolts securing the ignition coil and install the new coil following the reverse of the removal procedure.