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  • Briana Martinez

Why is My Engine Misfiring: Part 1

Updated: Oct 2, 2023

Car owners often face the frustrating and costly issue of engine misfires. This occurs when the fuel mixture in one or more engine cylinders fails to ignite properly, leading to a significant loss of power, decreased fuel efficiency, and even severe engine damage if left unattended. To better understand why your engine may be misfiring, read on.


Faulty Spark Plugs

One of the most common causes of engine misfires is faulty spark plugs. Spark plugs are responsible for igniting the fuel and air mixture in the engine's combustion chamber, which creates the power that

holding spark plug
Spark Plug

propels the car forward. Over time, spark plugs can become worn, fouled, or damaged, which can prevent them from firing properly. When this happens, the engine may misfire or run poorly.


If you suspect that your spark plugs may be the culprit behind your engine misfire, it's a good idea to have them inspected and replaced if necessary. Most automakers recommend replacing spark plugs every 30,000 to 100,000 miles, depending on the make and model of your car.


Bad Fuel Injectors

Another common cause of engine misfires is bad fuel injectors. Fuel injectors are responsible for spraying fuel into the engine's combustion chamber, where it mixes with air and is ignited by the spark plug. If a fuel injector becomes clogged, damaged, or otherwise fails to function properly, it can cause an imbalance in the fuel-to-air ratio in the engine, leading to misfires and other problems.


To prevent fuel injector issues, it's important to follow the manufacturer's recommended maintenance schedule for your car. This typically involves having the fuel system inspected and cleaned at regular intervals, as well as using high-quality fuel and keeping the gas tank at least a quarter full to prevent sediment from accumulating in the fuel system.


Dirty Air Filter

A dirty air filter can also cause engine misfires by restricting the flow of air into the engine. The air filter is responsible for removing dirt, dust, and other particles from the air before it enters the engine's combustion chamber. Over time, the filter can become clogged with debris, which can reduce airflow and cause the engine to run poorly.

A car air filter that is dirty
Dirty Air Filter

To avoid air filter-related engine issues, it's important to check and replace your air filter regularly. Most automakers recommend replacing the air filter every 15,000 to 30,000 miles, depending on your driving habits and the conditions in which you drive.


Key Takeaways

  • Faulty spark plugs are one of the most common causes of engine misfires.

  • Most automakers recommend replacing spark plugs every 30,000 to 100,000 miles.

  • Bad fuel injectors can also cause engine misfires by disrupting the fuel-to-air ratio in the engine.

  • Follow the manufacturer's recommended maintenance schedule for your car to prevent fuel injector issues.

  • A dirty air filter can restrict airflow and cause engine misfires.

  • Most automakers recommend replacing the air filter every 15,000 to 30,000 miles.


Schedule Your Next Fix Today

Engine misfires can cause severe damage and safety hazards if left unchecked. At Seymour's garage, our expert technicians use advanced equipment and techniques to diagnose and repair engine misfires, providing reliable and high-quality repairs.


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