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Old 11-21-2020, 09:12 PM   #23
Daves55Sedan
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Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
Default Re: Miss on newly rebuilt 292

If the miss is not erratic, but rather, symmetrical or occuring at the same cylinder each revolution, the first suspect would be the plug or plug wire for that cylinder. If you can identify which cylinder is miss-firing, it's usually a matter of just replacing the ignition parts for that cylinder (at least in your case whereby compression and so forth seems to be okay).
Check underside of distributor cap to see if a portion of the tower socket on one of the cylinders has a gorge in it or is busted off altogether. That could be your problem.
Another thing to check is the distributor cap tower sockets at the top. Pull the plug wires out of each one-at-a-time and see if any tower sockets are greenish looking. If so that is corrosion which is preventing electrical continuity between the tower socket and plug wire terminal. This is something you always need to keep in the back of your mind for misfire problems if you live in an area that has morning dew and condensation during the transition between late afternoons and evenings (usually in spring and fall seasons).
If this occurs, you can clean that tower socket with a chemical or spin a piece of crocus cloth around in there with the butt end of a pencil until it is shiny copper or aluminum, whichever version of cap you have. THEN, you need to get a pipe cleaner, treated with high-dielectric silicon compound and smear it all around in EACH tower socket, then plug your wires back in. Make sure all the rubber boots have NO cracks and are still pliable or replace them.
What I would say you could immediately ignore is points and condenser. If the points are carrying the spark for other cylinders, it wouldn't skip just that particular cylinder every time.
For the most part, condensers either work for all cylinders or they don't work at all. One notable exception is that the cheap chinese made condensers will break down at the point of an engine running at normal operating temperature, say 190 degrees, but the engine will keep running till you shut it off. If you come back and try to start the engine a minute later, it will never start until the temperature of the condenser decreases to around 95 degrees. Then it will start, but you'll have the same problem if you stop somewhere for a few minutes and want to start again.
All the chinese made points and condensers are very poor quality.
I have been using Napa Echlin brand heavy duty series without any problems the past couple years, but I think they're made in Mexico now. Not sure if the new ones are substandard as the chinese made junk is.
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