Originally Posted by stevieturbo

Some simple coils just require an earth to charge, and once this is removed they fire.
Some require a 5v signal to either tell them to charge, or fire.
Some may require anywhere between 0-12v to tell them to either charge or fire on application or removal of that voltage.

You have no idea what sort of signal your ecu outputs, nor the wasted spark drivers. So you've no idea whether the COP's you intend to use can even be used with your ecu.

Fitting unsuitable ones can fry the coil drivers in the ecu, or the coils themselves.