If you are sure of that then I stand corrected. Sportiva posted an ignition schematic that indicated that it is a Hall sensor and it works with the Bosch ignition module for a later 3 wire distributor which is definitely Hall.
Well, in the parts bin at least the only replaceable/serviceable part is described as a pickup coil, which to my ears sounds like an inductive part. So I stand corrected too. Although it seems a failure of that part would cause similarly terrible running. If I spin my dizzy rapidly and listen, I don't always hear the injector pop.
With inductive pickups the gap between the rotor and the coil is important. You loose the signal if the gap is too large. Maybe there is excessive play in the distributor shaft that causes the gap to vary or maybe the coil is loose.
Well, the snap ring wasn't in the groove. So that's possible, although I'd really need to see a known good one to tell if the play in the shaft is excessive.
So far, from what I've read, a bad hall sensor or pickup coil would manifest most of my symptoms.
This is the old rotor. I replaced it not long ago with a proper one from Centerline, with the built in rev limiter. This one had been on the car for about 8 years and I just assumed the cracking/discoloration was normal.
I started a new thread about distributor rebuild. Couldn't find ANYTHING documenting this using the search.
If there is play in the distributor shaft side to side, that is a problem. Up and down not so much as the pin in the shaft tends to be loose as new and allows some movement up and down. If the shaft is suspect, I think replacement is in order. I too searched high and low for info on rebuilding the early distributor and there really isn't that much out there in info and/or parts. I ended up posting and was able to source a nos distributor from a guy in montreal. I linked that exchange above^ in an earlier post. Maybe reach out to him and see if he has another? They are extremely hard to find. I have an early distributor that is apart and missing some stuff (vacuum pot and misc. screws) but it did work and I am happy to send to you so you can give it a shot. I will check with my local mechanic and see if he has one assembled.
Sine mine seems mechanically sound I'd prefer to just replace the $30 pickup coil than buy a new one, which may or may not have electronic issues too. I wonder if there's a special tool like a gear puller that's required? Must be a service manual for the part SOMEWHERE in the WWW.
It does, but mine has no lateral play so I think it's fine.
And to be sure, I'm not even sure how you're supposed to test a pickup coil, other than to note the car has ignition problems (like mine) with no other measurable faults.
I'm not even sure how you're supposed to test a pickup coil
Spin the distributor and monitor the output on an oscilloscope. But since the average Giuseppe does not have the equipment to do that nor does he know what the pulse is supposed to look like, you can only check it for continuity with an ohm meter.
I will be following your progress.