Reasons Behind Engine Backfiring in Cars

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Reasons Behind Engine Backfiring in Cars
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Most of the people have actually seen an engine
backfire but fail to understand the actual issue
and what causes it?
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Backfiring is the process of a spark plug, or
multiple spark plugs, igniting the fuel in their
cylinder out of turn, in a part of the combustion
process where the exhaust valve is open on that
cylinder.
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Here are some causes of engine backfire which
will let you know the actual reason behind the
issue.
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Engine running too rich
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If your engine is being supplied more fuel than
it needs to burn efficiently, then its called a
rich fuel to air mixture and can be caused by a
dirty air filter.
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Whenever an engine runs too rich there is too
much fuel to create an explosive fast-burning
flame and the fuel burns slower isnt complete
before the exhaust part of the engine cycle.
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When the exhaust valve opens on that cylinder,
the extra air allows the unburned fuel to
explosively burn and the popping noise of a
backfire is heard.
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Engine timing is incorrect
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This is one of the most leading reasons due to
which an engine misfire occurs and is also known
as retarded timing.
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This means that the engine cycle of
fuel-compression-ignition-exhaust in the top end
isnt in sync with the bottom end.
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This causes the ignition cycle to begin late in
the combustion chamber and ignite the fuel when
the exhaust valve is opening.
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Cracked distributor cap
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In cars that dont have ignition coils on the
spark plugs a distributor cap and wire set are
used to send the electrical pulse to the spark
plugs.
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If the distributor cap is damaged, then moisture
can get in and cause the spark from one cylinder
to go to another incorrect cylinder.
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Whenever the incorrect cylinder fires out of time
and the exhaust valve is open simultaneously, you
will experience an engine backfire.
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Carbon tracking on spark plug wires
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The cars where the distributor cap is used all
the spark plug wires are attached to the top of
the distributor cap.
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In due course of time, the environmental factors
can cause the spark to travel from one spark plug
wire to another in close proximity.
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When this happens frequently a carbon track forms
which is like a shortcut for the spark and causes
a misfire very similar to that of a cracked
distributor cap.
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Conclusion
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The above-mentioned factors are some of the
reasons behind the engine backfire in your car.
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Whenever you experience an engine backfire, then
take your car to an automotive shop to fix the
issue as soon as possible.
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