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Ford EDIS
From Wikipedia, the free encyclopedia
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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.
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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.
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See also
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
 
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