🎬 VIDEO: How to rebuild your coil box

[TinLizMitch]

Over the past few weeks, I noticed old Liz was starting to develop a misfire, which at first, I thought was one of her coils beginning to fail. However, upon testing each coil myself, and taking them to visit a fellow Model T enthusiast with his 1914 Touring, running his car on my coils, revealed that there was nothing wrong with them. Still, to be on the safe side, I bought some additional coils from him, so I had some spares!
Fast forward, I've been busy replacing (and cleaning) the coil contacts where needed, and while I was at it, replaced my rather shabby looking porcelain insulators.
re-connecting everything back up, and ... well you'll have to wait and see!

https://youtube.com/shorts/GRq0yq74m3Q

 

[rotorwrench]

If a person in running off a battery then it can be used to see if there isn't fault with the magneto system. The magnets can lose gauss over time and the coils can have insulation deterioration. The pick up can get crud on it too. The timer need to have maintenance done on it now and then as well.

 

[TinLizMitch]

I can safely say it wasn't the timer, as it was recently replaced (see my video on that one).
The misfires occur both on battery and on magneto, and it would be bad luck indeed if both were faulty! Each of my coils was re-tested and they are all working 100%. I could only put the problem down to a bad connection somewhere, hence the coil box rebuild. I cleaned everything, and replaced the parts that needed it. Presto!

If a person in running off a battery then it can be used to see if there isn't fault with the magneto system. The magnets can lose gauss over time and the coils can have insulation deterioration. The pick up can get crud on it too. The timer need to have maintenance done on it now and then as well.

 

[rotorwrench]

Pardon me, but I should have been more specific on the coils I mentioned previously in reference to the magneto. I meant the magneto coils that pick up the current from the rotating magnets on the flywheel.

The trembler type ignition coils have a ******** circuit that can get funky at times. There is a relatively expensive electronic test tool that allows a person to test them and make slight adjustments to the trigger mechanism that makes the induction happen. A weak coil can be due to a failing condenser or a mis-adjustment of the trigger mechanism.

Other things that can cause misfire could be fouled plugs or sticking valves. A slightly lean condition can cause backfire through the carburetor or hiccups as I call them on a model T. A small vacuum leak can do that.