Mercury E43Z-12A297-A Module - Ignition

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Before replacing ignition components, check for Federally mandated extended warranty eligibility. Be aware that disconnecting the battery may affect the Powertrain Control Module (PCM).To replace the Duraspark ignition coil, disconnect the negative battery cable, mark coil wires, remove high-tension lead and coil connections, and remove coil bracket bolts. Install a new coil with silicone grease inside the high-tension lead boot.To replace the Duraspark ignition module, disconnect the negative battery cable, unplug module connectors, remove mounting screws, and install the new module.For the Duraspark stator assembly, remove negative battery cable, distributor components, armature, E-clip, ground strap screw, wire retaining clip, and stator assembly. Clean and reinstall the lower plate assembly, stator assembly, armature, and other components.For V6 engines, similar steps apply, but include additional steps to remove the lower plate assembly and stator assembly.For the TFI-IV ignition coil, locate coil assembly, unplug the connector and wire, remove screws, detach coil, and install new coil with silicone dielectric grease in the coil-to-distributor lead boot.To replace the TFI-IV ignition control module, follow the specified steps for removal and installation. Apply silicone dielectric grease to the module's back.For TFI-IV or DI distributor stator replacement, remove distributor cap and wires, follow steps for stator assembly removal and installation. Check for wear and replace faulty parts.

The ignition control module is a delicate and relatively expensive electronic component, and improper procedures could lead to damage to the module or other electronic devices, including the EEC-IV microprocessor. Check with your dealer about the Federally mandated extended warranty on devices under computer control before attempting to diagnose and replace the module yourself. Note that certain models use a special DuraSpark II ignition control module with altitude compensation features for spark timing and engine performance at high altitudes. An intermittent no-start condition may occur in some years and models of SSI and DuraSpark ignition systems, where the engine starts momentarily and shuts down instantly or runs the duration of a trip but won't restart afterward. Striking the module or applying heat won't fix it, confirming the ignition control module as defective. To check the ignition control module on DuraSpark systems, examine power to the module, resistance of the distributor stator, and ground circuit continuity. For TFI-IV ignition control modules, inspect power, resistance between terminals, and the PIP to SPOUT circuit. Always ensure safety measures when working with the ignition system. For ignition control module replacement, detach the negative battery cable, unplug electrical connectors, remove mounting screws, and replace the module or stator. Reassemble components following the reverse order of removal and use appropriate lubrication or dielectric grease when specified.

The ignition control module is a delicate and relatively expensive electronic component. Failure to follow the procedures could result in damage to the module or other electronic devices, including the EEC-IV microprocessor itself. Additionally, all devices under computer control are protected by a Federally mandated extended warranty. Check with your dealer before attempting to replace them yourself. Duraspark I and II ignition control module: Detach the cable from the negative terminal of the battery. Vehicles equipped with a Duraspark I or II system may have either the standard Duraspark I or II module or the universal ignition control module. If your vehicle is equipped with the standard module, unplug both connectors; if your vehicle is equipped with the UIM module, unplug all three connectors. Remove the mounting screws and detach the module. Installation is the reverse of removal. TFI-IV ignition control module: Remove the distributor from the engine if access to the module is blocked. Remove the two module mounting screws with a 1/4-inch drive 7/32-inch deep socket. Pull straight down on the module to disconnect the spade connectors from the stator connector. Whether you are installing the old module or a new one, wipe the back side of the module clean with a soft, clean rag and apply a film of silicone dielectric grease to the backside of the module. Installation is the reverse of removal. When plugging in the module, make sure that the three terminals are inserted all the way into the stator connector. Disconnect the negative cable from the battery. Disconnect the electrical connector from the EDIS ignition control module. Remove the screws securing the EDIS module to the lower intake manifold. Installation is the reverse of the removal procedure. Prior to installing the EDIS module onto the manifold, apply about a 1/32-inch of silicone dielectric compound to the mounting surface of the module.

The caution is that the ignition module is a delicate and relatively expensive electronic component, and improper procedures could lead to damage to the module or other electronic devices.

The caution is that the ignition module is a delicate and relatively expensive electronic component, and improper procedures could lead to damage to the module or other electronic devices.

Measure battery voltage.

Attach the wiring harness connector(s) to the ICM.

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.

Pull the right side of the module down the distributor mounting flange and back up to disengage the module terminal from the connector in the distributor base. The module may be pulled toward the flange and away from the distributor.