Posted by Steve@Advance on May 05, 2020 at 18:32:53 from (66.169.147.211):
In Reply to: Ford 3000 posted by Michael Tankovich on May 05, 2020 at 14:00:49:
Typical causes of intake backfire:
Retarded ignition timing, be sure the centrifugal advance is free and working.
Weak spark, check the spark quality at the plug end of each wire. Caps and rotors, all ignition components are aftermarket, not always the exact match and questionable quality. Many times the timing between the rotor and cap terminals is off. Try to determine that the spark is happening when the rotor is aligned with the cap terminals.
Valve problems, an exhaust valve not fully opening will cause rhythmic popping back through the intake, increasing with throttle and load. Check the valve lash, visual inspection of all valve components. Have you run a compression test?
Lean mixture. Have you tried a partial choke to see if that gives improvement? If so it's too lean. Could be caused by lack of fuel to the carb. Disconnect the fuel line after the pump, direct the flow to a clean container, start the engine, let it idle. The pump should deliver a strong pulse of fuel with each stroke. Be sure to check the pump even if it is not suspect. Pumps do not like ethanol gas.
If good, reconnect to the carb, start the engine, at idle, remove the carb drain plug, catch the flow in a clean container. It should flow a good stream, not a drip or stop until the engine dies. Look at what was caught in both tests. If there is trash in the container, the tank is contaminated and so will be the carb.
I will agree with others, the Holley carbs were troublesome. Fought one for years, rare to have one defeat me, but that one did! The new Zenith made the tractor usable again.
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