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You have a few things to check, first off a backfire is usually associated with a timing issue, you would notice a difference in ow the engine runs, it will lack power and be rough.
Next a backfire requires unburnt fuel, so check the ignition system for problems, bad or incorrectly gapped plugs, bad wire, and if it's older look for a cracked distributor cap or worn rotor.
Then look to the fuel system, it may be getting more than it can burn.
Lastly valves, you may have a bent one, or one that is not opening or closing completely.
What else can I help you with?
Will a bad timing chain make the engine backfire?
Incorrect Timing Can Cause Backfire.
What is making a Lincoln ls 2000 v8 backfire?
what is making my Lincoln ls v8 backfire under the engine
What must be attached to each carburetor on a gasoline inboard engine?
A flame arrestor. This prevents a backfire from igniting gasoline vapors in the engine compartment.
What makes a carburetor backfire?
Several things could make a carburetor backfire. The engine could be out of time. the carburetor could have a stuck float, or the engine could have a stuck valve.
Can fuel filters and or fuel pump cause backfire?
No, backfire is usually caused by park plug wires that are installed incorrectly or an engine that is out of time. Fuel filter and pump will not cause backfire.
Why does your Audi TT backfire?
Engine Timing, Unburnt Fuel
What causes 1988 Dodge Dakota tuck backfire?
Backfire is normally caused by engine out of time, or spark plug wires installed incorrectly.
Why does your engine backfire when you try to start it when it is stone cold?
Incomplete combustion
Why does your Briggs and Stratton 11.5 hp engine backfire?
Timing is off ...
What is a required to have a backfire flame arrestor?
a boat with a gasoline inboard engine
Why do you need a backfire flame arrestor?
Prevents possible engine fire
Can the wrong spark plug cause an engine to backfire?
somtimes usually not
