ION-related IGN Comments & Coil Quest

[eric schumacher]

Hi
If all you guys want to do is measure the secondary current why not just use
a current transformer strung on the HT lead.

On a second subject Bosch coils have a internal gap in parallel with the HT
terminal to protect the coil in case of an open secodary. This has an
interesting effect when the plug gap opens up wide due to age. The engine
gets hard to start when cold but will not miss under any kind of load.
Cause? with a cold plug it jumps inside the coil rather in the plug.