I am about to fit Ford EDIS (Electronic Distributorless Ignition System) into my '87 E30 316 (M10 engine). While I was testing EDIS something happened to the original ignition system.
I just disconnected HT leads from the distributor, and connected them to the EDIS ignition coil. I started the engine , and let it run for
20 min or so.Original ignition control unit (TCI) was connected, as was ignition coil and pulse generator (in the distributor). I only disconnected HT leads.
When I finished testing EDIS, I connected HT leads back - and the engine would not start. I checked (ten times) that I connected HT leads in right order (1-3-4-2 anticlockwise). I removed one HT lead and connected it to a spare spark plug - and I had the spark.
I than connected EDIS back - the engine started immediately. Again back to the original ignition system - now no spark at all.
So I checked if I had +12V and ground at ignition control unit - OK, lead from it to ignition coil is OK, pulse generator resistance was OK, only pulse generator gives 0.75V (should be 1-2 V). Perhaps I should mention that it was -4 Celsius (-25F) when I measured this. Ignition coil is ~0.8 ohm primary, and ~8kohm secondary.
I tried with spare ignition control unit - and it does not work.
Any thoughts about what might have cause pulse generator to fail (if it failed)? Or did I miss something?