Are my plug wires bad and if so would that cause stalling after the car is hot? - Page 15 - Alfa Romeo Bulletin Board & Forums
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post #211 of 302 (permalink) Old 05-07-2017, 06:14 PM
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The early distributors are inductive.
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post #212 of 302 (permalink) Old 05-07-2017, 06:54 PM
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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.

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post #213 of 302 (permalink) Old 05-07-2017, 06:56 PM Thread Starter
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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.


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post #214 of 302 (permalink) Old 05-07-2017, 07:06 PM
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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.
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post #215 of 302 (permalink) Old 05-07-2017, 07:15 PM Thread Starter
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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.


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post #216 of 302 (permalink) Old 05-08-2017, 05:22 AM
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Rotor

Check the rotor for discoloration in the area where the resistor connector between the center contact and pointer end. There has been numerous failures of these resistor designed rotors.

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post #217 of 302 (permalink) Old 05-08-2017, 06:50 AM Thread Starter
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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.
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post #218 of 302 (permalink) Old 05-08-2017, 07:23 AM
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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.
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post #219 of 302 (permalink) Old 05-08-2017, 07:38 AM Thread Starter
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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.

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post #220 of 302 (permalink) Old 05-08-2017, 08:08 AM
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Doesn't the shaft ride in a bushing, like most distributors? There are certainly sources for metric size bronze bushings.

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post #221 of 302 (permalink) Old 05-08-2017, 08:33 AM Thread Starter
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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.

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post #222 of 302 (permalink) Old 05-08-2017, 08:39 AM Thread Starter
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et voila - https://www.yourmechanic.com/article...gnition-pickup & http://www.ehow.com/list_5946595_sig...ckup-coil.html

Sort of a smoking gun, especially the intermittent issues, shuddenly shutting down, etc.

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post #223 of 302 (permalink) Old 05-08-2017, 11:40 AM
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Looks promising! If it's any consolation, when it's running well, you will shortly forget about how frustrated you are. It's just like a home remodel only worse. lol
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Originally Posted by chairmankaga View Post
et voila - https://www.yourmechanic.com/article...gnition-pickup & Signs of a Bad Pickup Coil | eHow

Sort of a smoking gun, especially the intermittent issues, shuddenly shutting down, etc.
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post #224 of 302 (permalink) Old 05-08-2017, 11:43 AM Thread Starter
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New pickup ordered and the distributor now fully disassembled with no lost or broken bits. Just required some brute force.


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post #225 of 302 (permalink) Old 05-08-2017, 11:56 AM
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Quote:
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.

Ed Prytherch
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2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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