The Ford EDIS or Electronic Distributorless Ignition System is a computer-controlled ignition system developed by Ford that uses an ignition coil for each pair of cylinders (wasted spark). All the coils are placed in a single module called a coilpack.
Vehicles with EDIS Ford used the EDIS module on a number of vehicles from 1988 to 199X.
EDIS-4 The EDIS-4 module is used on the following vehicles equipped with the Ford HCS engine, and the 1.9-liter straight-4 Ford CVH engine, between 1988 and 1993: Ford Escort / Mercury Tracer Ford Fiesta (Europe) Ford Escort (Europe) Ford Sierra (Europe) Ford Scorpio (Europe) Ford Mondeo (Europe) This system was also used on the 1995–2001 4-cylinder Ford Rangers and 1995–2001 Mazda B2300, B2500. But was incorporated into the EEC-V ECU, so there is no external module.
EDIS-6 The EDIS-6 module is used on the following vehicles equipped with the 4.0L Ford Cologne V6 engine and 3.8L Ford Essex V6 engine between 1990 and 1997: Ford Ranger / Mazda B-Series Ford Explorer / Mazda Navajo Ford Aerostar Ford Mustang (3.8L V6) Ford Thunderbird Supercoupe Ford Taurus SHO V6 (1989–1995) Ford Windstar Ford Mondeo The European Ford Scorpio 2.9 V6 24V Cosworth also uses the EDIS-6 module.
EDIS-8 The EDIS-8 module is used on the following vehicles equipped with the 4.6-liter V-8 Ford Modular engine between 1990 and 1997: Lincoln Town Car, Mark VIII Ford Crown Victoria / Mercury Grand Marquis Ford Thunderbird / Mercury Cougar Ford Mustang
The EDIS-8 Module was also used in Some later 5.0L Ford Explorers until around 2002
Aftermarket use in non-Ford vehicles The EDIS system's relative simplicity, in particular the fact it does not require a cam sensor, makes it a popular choice for custom car builders and classic car owners looking to retrofit a modern ignition system to their vehicle. The crankshaft-mounted trigger wheel, VR sensor, EDIS Module and an ignition control computer can all be easily fitted to most older engines that originally used a traditional distributor for ignition.
See also Profile ignition pickup
References US Patent Number 4,661,778: Ignition diagnostic monitor US Patent Number 4,922,874: Automobile electronic control modules communicating by pulse width modulated signals US Patent Number 5,014,676: Ignition system with repetitive sparks Ford EDIS technical information MegasquirtnSpark-extra EDIS mode US Patent Number 6,115,665: Memory Efficient Computer System And Method For Controlling An Automotive Ignition System E-Type UK EDIS/Megajolt Ignition Support Thread