I have a problem with my #3 cylinder in my '48 8N. I pulled the plugs on all cyliners. #3 plug was covered with crud, not firing.
I checked dry compression: #1 90#, #2 90#, #3 85#, #4 90#. Didn't change with a wet test
Put new plugs and wires on. Pulling the wire off #3 plug has no effect. Spark at #3 is OK
I tried running automatic transmission fluid through the carb to see if that would help. It seems to have helped a little.
It seems that I'm not getting any power out of #3 even though it has compression and spark.
Maybe I'm not getting fuel into #3 because of bad valve or bad tappet or bad cam??
Occasionally it seems to fire and a puff of smoke comes out the exhaust.
Thanks in advance for any help!