I just replaced the muffler and starter switch on my '21 T. I tried to get the generator to charge with no luck.
Now I have a miss. All 4 plugs have spark and carb adjustment makes no difference. I'm trying to decide what to do next. Got any suggestions?
Tommy : As I posted on the classified post, check and clean the plugs, do a compression check looking for a sticky valve and then check for a vacuum leak at the intake mounting surface or where the carb mounts. Even though it appears that you have all four plugs getting spark, I'd still have a close look at the timer. Good luck : Bruce
Swap the coils around to see if the miss moves to a different cylinder.
Is the miss at idle? What happens if you accelerate just a little does the miss go away? How about if you adjust the spark advance? My 27 will miss a little until it gets good and warm then everything is smooth....
All the connections to the coil box and plugs tight? Try moving the coils around as Jerry V. says.
Also try holding down the coil points down one at a time while the engine is running. You will quickly find out which one is missing by doing that. If one doesn't have any change that's the one that's not firing.
I checked the timing and I believe it is right. The plugs were all a little sooty so I cleaned them. That seemed to help but I still hear a skip from time to time. Today is the third day the car has been driven and I must have had the carb adjusted a little rich. The spark looks good and looks the same at the plugs but my coils don't all sound the same when they buzz.
I can not trace the miss to any one cylinder grounding the plugs with a screwdriver.
If MMO is available locally and for cheap try a little in case it's a lightly sticking valve. The worst thing that can happen is you'll be out seven bucks.
It cured my little truck's intermittent miss
My engine is newly rebuilt with less than 25 miles on it. After starting I move the spark lever down about 3/4 of the way to smooth out the engine. The last 1/4 seems to make no difference. Also, I'm not sure my engine will idle down as low as it should. I can see no sign of leaks at the carb mounting or intake manifold.
So... a fresh rebuild with a miss sounds even more like a sticky valve(s) or valves with too little clearance after warming up fully. What were the gaps set at?? Did you have a close look at the timer? Cheers : Bruce
in another thread he stated that he disassembled the points on his coils and bead blasted them and reassembled without adjusting.
I'm surprised it runs as well as it does. Personally I would not look inside the engine, but rather, outside
Cleaning the plugs seems to have cured the miss. However it sounds like I am running on borrowed time, having "restored" my coils myself. I will be expecting a coil, or two, to fail every time I drive it. What should I do, exchange by coils for professionally rebuilt, tested, and adjusted ones? What is the cost of professionally done coils? Major medical expense, thanks to an uninsured driver, kinda limits what I can spend on the T.
Your current financial issues aside, send them off to Ron Patterson - call first for directions in determining "rebuildability" !
Brent Mize does splendid work on old coils.
Here is his price list
I'm using a set of Brent's coils and they work great. Before getting Brent's coils, I knew I had a problem as my car ran a little better on "battery" than on "mag". Unless you're running a distributor, the coil/magneto set-up is the most critical thing to allow your car to run properly, although an excellent timer is a close second .
I had a coil finally let me down. We had family and friends at our house today for our youngest grandson's birthday celebration. Plans included Model T rides. I started the car and moved it out of the garage this morning to wipe the dust off. It ran rough. I found that #2 cylinder was dead. Moving #2 coil to #1 verified the coil was the problem. No more Model T rides until I get another coil.