hello, i have a electrical glitch that i'm hoping someone can help with. i have a 1996 escort cosworth that i have converted to L8 management. i have now also had a wasted spark driver fitted to the ecu and i am using the original eecIV coil packs. my problem is that when i connect the wire from the coil pack sub loom to pin 21 on ecu multi plug that is for the tachometer i get a completely random missfire. when i say missfire it's not like having a dodgey plug lead sort of missfire, it's almost like it loses the spark completely. but only for a split second then runs perfect for a few seconds then again dies and so on. it does it at idle and all through the rev range, it doesn't increase in frequency when i put the engine under load but it's bad enough to make the car bunny hop and back fire when you try to accelerate, as i said it seems to be completely random. when i disconnect the wire from pin 21 on the ecu it runs fine no missfires at all but the tach doesn't work. any help would be much appreciated. cheers

 

can anyone help with this? any ideas would be welcome. cheers