Quote:
Originally Posted by FrankF3
Does the 1811 engine use waste spark ignition (firing both plus at the same time - during compression and exhaust stokes?) If so, the current path for a plug firing on compression also involves a plug firing on the exhaust stroke of the opposite cylinder. I had an onan that used this and disabling one plug disables the other plug at the same time so it won't run. A bad plug wire on one cylinder can effect the other cylinder as well.
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Yes it is wasted spark.... and it uses one coil with two plug wire. Not really sure what you are getting at. You can't "disable" one plug or the other. Plug wires do fail though.
I agree, one cylinder is lean and the other is not. Could be both cylinders are lean and one plug isn't firing good. Check the inside of the plug boots. Seen several times where the end is corroded in the boot that goes on the plug causing it not to fire. If you see nothing, and sure you have good spark, I'd do a compression test. Could be a vac leak in the manifold as Sam suggested, but I haven't seen that as often as the other two issues pop up. (No spark or one cylinder with low compression.) Could be a lot of things..... Your going to have to do a little more
