When your car has leftover fuel in the exhaust and the cylinders, that fuel explosively burns and creates a loud popping sound. Specifically, here we mean delayed timing, which causes the backfire. Delayed timing means that the ignition cycle of your engine starts late in the combustion chamber, and ignites the fuel as soon as the exhaust valve is opening instead of waiting for it to be fully open. If the cap is cracked, it allows moisture to creep in, which causes the electrical spark to jump to the wrong cylinder, causing a backfire.
Carbon tracking can come into play in a variety of situations, the first situation involving sparks that are generated by wires on a distributor cap, can start to hop from one wire to another very quickly and thus a carbon track is formed which is essentially a shortcut for the spark. Here are the basic steps your internal combustion engine follows to turn fuel and air into horsepower: Step 1: Intake The intake valve on your fuel cylinders opens, pulling a mixture of fuel and air into the engine.
Step 2: Compression The intake valve shuts and a piston compresses the air-fuel mixture mentioned above. Step 5: Exhaust and Propulsion The exhaust valve opens and closes, allowing smoke and residue from the combustion process to escape through the tailpipe. Poor Fuel-Air Ratio The right ratio of fuel and air is critical to proper engine combustion. We'll look for the following troublemakers: Faulty Oxygen Sensors In newer vehicles, computerized sensors help ensure the air-fuel ratio is correct.
Leaky Exhaust Systems Leaks in the exhaust system, sometimes called vacuum leaks, can sound more like a screech than a bang as excess air gets sucked in. Dirty Air Filters Even something as simple as a dirty air filter can potentially trigger a backfire. Faulty Fuel Injectors Injectors that supply too little or too much fuel to the cylinder can also create a poor fuel-air ratio.
Misfiring Spark Plugs Spark plugs that fire out of turn or not at all can also cause backfiring. Bad Timing In the four-steps of engine combustion, timing is everything. Up Next. Avoiding your car's recommended maintenance schedule won't save you money in the long run. Learn how following your vehicle's schedule can help save your ride! Is that an earthquake or just your car shaking?
It's probably not the first one. Find out what could be making your car shake and what you can do to fix it. Dirty fuel injectors mess with your engines internal combustion processes, leading to a variety of issues. Learn what happens when fuel injectors go bad.
Find Store. Find a Different Location Find a Store. Do you want to change your Preferred Store? Too much fuel and too little air means some fuel can pass into the exhaust, and will, if it's hot enough, cause a combustion in the exhaust pipe.
If ignition occurs in the piston too late, the explosion can continue into the exhaust manifold - creating an afterfire. A lean air-fuel mixture burns more slowly than a rich air-fuel mixture.
This can mean combustion takes place for longer, spreading into the exhaust system and firing out of the exhaust pipe. A lean air-fuel mixture could be caused by:. If your car backfires or afte rfires it is unlikely to cause any damage to your engine or exhaust system.
However, such a scenario does mean there is already a fault in one of your car's components, and it should be addressed swiftly - if only to stop the loud bangs coming from your exhaust. We use cookies on our website. To find out more and manage your cookie preferences with us please view our cookies policy.
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