Re: Tecumseh 22hp One cylinder intermittently
OK, thank you 38Racine! you have confirmed everything I'm seeing, re the two green kill wires going into the sleeve and coming out as only one green wire, and that each has a diode more or less hidden by the sleeve!
At this point I have replaced the coil on the weak cylinder, thought I was home free - not so. Not sure I set the gap exactly right: used a standard flat feeler guage and combined the .0120 and the .004 to get the .0124, placed it in the center of the coil between it and the magnet. It does run, but the intermittent issue is still there and now there's an occasional backfire, which I attribute probably to me not getting the air gap measured just right and so affecting the timing on that cylinder - not sure - maybe I should have measured the air gap on the outside ends of the coil instead of the middle. ??
Intermittent still, even with the green leads disconnected from the coil and taped off.
So, I removed the front cover from the carbs, checked the fuel flow to that cylinder - seems to flow ok, no obstructions, no obstructions visible from the inlet fitting.
I removed the bowl cover - looked ok, and I put it back on.
Since it still runs intermittently even with the green leads off the coil I'm thinking it has to be an intake system problem. I'm especially suspicious of those electrical devices - I think you or someone called them "anti-backfire solenoids": I know nothing about these things so I don't know how to troubleshoot them, and apparently you have to totally remove the carb to get to it.
Was it you who mentioned removing them and replacing them with bolts: do you think that would help in this case? And, what do you do with those electrical leads?
One observation I've had is that even with the green wires disconnected from the coil, and while its running, turning off the key does in fact kill the engine! Is this because those electrical things are killing the fuel flow? If so, and if one of them is defective could it be causing that cylinder to fire intermittently?
I'm attaching a video so you can hear and see - the weak cylinder is on the r/h side in the video, (l/h side from the seat looking forward).
So, here's how it sounds. I'm thinking fuel flow. both kill wires are disconnected and taped off.
Maybe those electrical things on the carbs?
Note the surging as it runs at a high idle.
I don't think fuel pump as that would affect both cylinders.
OK - I can't seem to add the video since it's an MP4 taken on my Android Samsung Galaxy Note9 and it's too big even converted to a .zip - So I've copied in the file/link name below but I doubt that it will work for you.
I have been able to email this file to myself, so I know it can be emailed. It's 17mb btw.
Thanks again for your time and advice, let me know how it's going with your machine!
Last edited by mikeshoop; 07-14-2019 at 11:51 AM.
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