An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engine's cylinders. This can cause damage to your car's exhaust or intake if left unchecked -- and it also means that your car's engine isn't making as much power as it should, and is wasting lots of fuel.
A car can backfire when fuel vapors ignite in the exhaust system or intake manifold instead of inside the combustion chamber. Modern computer-controlled engines manage fuel and spark delivery with exacting precision, making engine backfires in newer cars rare.
There are several main reasons why certain people like their cars to be loud: it gives them a thrill, they want to show off, there are slight performance increases, and it's attention getting.
Backfires and afterfires are worth paying attention to since they can cause engine damage, power loss, and decreased fuel efficiency. There's a variety of factors that can cause your car to backfire, but the most common ones are having a poor air to fuel ratio, a misfiring spark plug, or good old-fashioned bad timing.
The way to make your car backfire is to disrupt the current way the engine works. This can be done by changing the fuel-to-air ratio, adjusting the timing, or removing the pieces of your car that muffle the exhaust sound.
Modern engines can still backfire, and a poor fuel ratio is one common cause of this. For starters, let's imagine there is too much fuel in the engine and not enough air. The spark inside the chamber may not burn up all the fuel, allowing a little extra gasoline vapor to enter the exhaust, and lead to a backfire.