Mercury D9VZ-12A199-A Module 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.

An intermittent no-start condition can occur where the engine starts momentarily and shuts down instantly or runs the duration of a trip but won't restart afterward.