A100 Ignition Timing oddity (Was: A100 Fuel problems)

For anyone who may run into the same problem...
Patient was a 1988 A100 (2.0 RT engine) which broke down. Extremely difficult to start. If I can start it, then it will run for about 10-15
mins then cut out. Not driveable as stalls too easily. I'm using regular unleaded for which I believe the timing should be 8 BTDC. Bizarrely I found that advancing timing to around 30 it would start quite easily....
It took me about 6 months but I finally found the problem. It was the coil. I had actually tested this very early on but moved on because the resistances were in spec, and I was getting a spark anyway. It also fixed an odd misfire I had beforehand below 2000rpm under load.
I'm not sure I understand the theory. I guess I had a 'weak' spark which needed more advance to burn the fuel in time.
I'd never have found it without a car to swap bits with (or lots of cash). So it's worth noting that the fuel distributor, ISV, coil, warm-up valve & distributor from a A100 with the 2.2 KU all seem to work fine!
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