Misfire

[arcturus]

A short time before my fire incident I changed to a 123 dizy as i was getting fed up with failing condensers.
On the last trip before my fire i had started to experience a misfire,occasional at first then more and more. eventually I was getting concerned about getting home but the fire intervened. Now I have the car back on the road and the misfire returned with a vengeance. I replaced the 123 with the old dizy and now the misfire has completely vanished. Contacted Amazon cars, who supplied the dizy and am returning 123 for examination.
My question is,are there any other causes of misfire other than ignition?
I might add that a new coil has been fitted and new wiring.

[Army]

In a spark ignition engine the expected source of ignition is the spark. Things however can go wrong see for example =>

https://en.wikipedia.org/wiki/Pre-ignition

To set the record straight - to help add a bit of clarity - you experienced a miss fire as in a missing of a heart beat? In other words the engine was lumpy and felt unbalanced?

[arcturus]

No, as in a hiccup. Not a back fire. As in ignition being momentarily switched off.Not as fuel supply being cut off.

[Ron Kwas]

arcturus;

"...are there any other causes of misfire other than ignition?" Sure...a "Misfire" is a very general term meaning one or more cylinders are not firing and contributing their power stroke to the crankshaft...it occurs due to loss, for ANY reason, of ANY of the vital components required in an Otto Cycle engine: Spark (at the right time), or (a reasonable) Air-Fuel Mixture or even Compression...so troubleshooting means narrowing the fault into one of these groups, then ever more specifically, until we can point to one root cause...

One valid and effective way of troubleshooting a misfire is component substitution, and you've already essentially established that 123 Ign Sys is somehow the cause...but since you've already sent much of the Ign Sys away, there's not much outside of the Ign Coil, (and HT wires, and Sp Plugs ?) left, and so not much left to troubleshoot...let's see what supplier says, bearing in mind that (I fear) they might not have a facility or the expertise for testing this equipment...

Cheers

[arcturus]

I'm now in contact with the makers in Holland with a view to having it returned there. Amazon cars emailed me just before I was leaving for the post office.

[arcturus]

hello again This is the reply that I received

How do you know the alternator and voltage regulator are in good condition?
Is is impossible to measure this with a standard voltage meter.
Very high voltage peaks (spykes) causes misfires.

It could be the ignition gets interrupted by high voltage peaks from the alternator / voltage regulator.

Of course the old fashion distributor doesn't have this problem because there are no electronics inside.

Please do the alternator test first.

Misfires are 90% caused by bad voltage regulation.

first of all the car has a dynamo not an alternator..Would that make any difference?
Secondly how could test out the regulator or dynamo for spikes. Ron?