Tecumseh 22hp One cylinder cuts out/in intermittently
This is my first post, very glad to be here!
I have a 22hp Stanley tractor which is actually made by Murray and has a Tecumseh engine.
It has worked great til I ran it completely out of gas. So I refilled the tank (93Octane) and resumed. Soon, if not imediately, it began cutting one cylinder out, intermittently.
Out/In/Out/In/Out/In, you get it.
Thought maybe fuel filter, replaced that with new, no change.
Thought maybe spark plugs, replaced both with new, no change.
Disassembled fuel pump to check for damage or debris -looked ok.
Replaced two of the fuel supply lines, and the vacuum line that apparently powers the fuel pump (never seen that kind of arrangement). no change.
Gas is clean, no water, etc.
When running it sounds like a switch is opening and closing turning one cylinder off, and then back on, over and over.
And, when it's running on both cylinders, it sounds perfect, no backfires, no mechanical noises, it just sounds normal.
I've read on a different post that there are two coils that share a common kill wire involving a diode, and that this may be contributing to intermittent operation. If so, would it be that one coil is bad (suddenly, just when I happen to run dry on gas???), or, would it be that the diode is the problem?? I have yet to uncover the coils/diode as I'm hesitant to believe that's the issue.
Would greatly appreciate any guidance on this! It has otherwise been a very dependable engine and I am hoping this is a simple matter.
Many thanks for your consideration!
Last edited by mikeshoop; 06-30-2019 at 04:27 PM.
Reason: Better Title