Posted by Steve@Advance on September 18, 2021 at 13:25:52 from (99.190.215.237):
In Reply to: M Farmall sputter posted by roy prins on September 18, 2021 at 11:17:38:
Kinda unusual for valves to stick on a running engine, and then unstick on their own. Might check the valve lash if it hasn't been checked since it went back together. That would give you a chance to look the valve train over. Be sure all the valves are opening equally and no broken springs or bent pushrods. But I'm guessing all will be well, as valve problems generally are not intermittent.
Intake backfire is typically caused by lean mixture, weak spark, cross fire, retarded ignition timing, a flat exhaust cam lobe will cause rhythmic backfire under load.
Cross fire can be caused from condensation under the distributor cap. If there is water trapped in the distributor, often it will boil up when the engine gets warm and condense under the cap. Then it dries out when it cools, repeats if still water in the distributor.
Weak spark can be failing points, failing condenser (very common bad new in the box), failing or wrong coil (wrong coil or coil/resistor combination).
Worn distributor bushings can cause the point setting to change, do strange things. Also can a stuck or sluggish centrifugal advance will retard the timing.
Have you checked the fuel flow through the carb bowl when it acts up? Should get a steady flow through the drain plug.
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