
Plenty of sparks on 1 & 4, and swapping the trigger wires on the Coil Pack, causes 2 & 3 to work, and 1 & 4 fail, so that rules it out.
Off to raid the local scrap yard and see if there are any more EDIS modules lying there.
Any other possible causes ?
Can always stick it the module on ebay if it turns out to be something else.