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  #1  
Old 06-27-2015, 01:40 PM
yeeter yeeter is offline
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Default Engine miss, 1811
What does this mean?

My 1811 is missing on one of the cylinders. Pulled the plugs and a whiteish powder on the right side, where the left side is more black (just realized I have two pics of the right side and none on the left side, will fix that)

Seems to be getting fuel (to the carb at least). Seems to be getting spark to both sides.

(Oh, the Autolite 26 is what I put back in it, maybe not exactly right but at the moment seems bigger issues to resolve)
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  #2  
Old 06-27-2015, 02:00 PM
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CubDieselFan CubDieselFan is offline
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Where you able to pull the plug while it was running (carefully) to see which one was not firing? This engine has one ignition module so I do not know if it goes bad if one could still fire. I would get the correct plugs, that would rule out the plugs.
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  #3  
Old 06-27-2015, 04:53 PM
yeeter yeeter is offline
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Pics of both plugs. Busy today, so additional eval is going to have to wait until tomorrow.
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Old 06-27-2015, 05:38 PM
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mudpatrol1 mudpatrol1 is offline
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looks like 1 cylinder is rich,and the other lean. use a inline spark tester to verify which cylinder is firing or not. check compression as well,might be a valve/carbon issue
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Old 06-27-2015, 05:55 PM
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Maybe a vacuum leak on one side of the intake manifold?
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Old 06-27-2015, 07:05 PM
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FrankF3 FrankF3 is offline
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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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Old 06-27-2015, 11:37 PM
J-Mech J-Mech is offline
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Originally Posted by FrankF3 View Post
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.
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
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Old 06-28-2015, 07:05 AM
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Originally Posted by J-Mech View Post
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
Jonanthan, I was referring that since the current path for spark involves both plugs, if one wire opens on one plug it will kill the spark on both .
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Old 06-28-2015, 09:24 AM
yeeter yeeter is offline
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Hmm. I will revist spark. Wonder if the wasted spark tricked me into thinking I had spark in both sides. I just need to work through this more methodically

Some great suggestions here that I would have never thought of. Stay tuned for more in sorting through them
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Old 06-28-2015, 09:34 AM
R Bedell R Bedell is offline
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Seen this on a M-20 with an intermittent miss...

http://www.onlycubcadets.net/forum/s...highlight=M-20
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