Mercury E43Z-12A297-A Ignition Module

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.

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.

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.

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

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.

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.

You should check with your dealer about the Federally mandated extended warranty on devices under computer control.

Caution is given that the ignition 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.

Measure battery voltage.