How to Fix Engine Misfires


A misfire is an error code indicating something is wrong with the ignition system. A misfire is a common problem caused by worn or damaged ignition system components. The problem is more likely to occur if the components fail within three to five years. If you don’t have a code reader, you can diagnose the problem manually by checking the spark at the affected cylinder.

Leaky head gasket

A leaky head gasket can cause misfires and cause the engine to lose compression. It can also lead to cracks or warped cylinder heads. Regardless of the cause, a damaged head gasket should be replaced as soon as possible to fix engine misfires. You can find out if you have a leaky head gasket by checking the coolant in your car’s oil.

When a head gasket fails, it causes coolant leakage into the cylinder. This can cause misfires, especially when the motor is revved up. A faulty head gasket can also lead to engine stalling.

Weared-out spark plugs

When spark plugs become too worn, they will create a weaker spark and can even cause engine misfires. Worn spark plugs can also make it challenging to start your vehicle. Additionally, they can cause a foul smell to emerge from the exhaust. Luckily, there are several easy ways to determine if your spark plugs are at fault.

The most basic remedy for a worn spark plug is to replace them. Changing them can help your car run smoother and improve fuel economy. Changing spark plugs will also ensure proper engine performance and prevent further damage to your car’s engine.

Leaky fuel system

If your car is misfiring, a leaky fuel system is one of the most common causes. You can check it by performing a misfire test, which can detect the cause of misfires by measuring the cylinder temperature. Misfires result from several problems, including a failure of the mass airflow sensor or oxygen sensor or inefficient fuel delivery.

If you ignore a misfire, it will continue to damage your engine. Leaving your car to run with a misfired engine will result in expensive problems later on and could even destroy your engine.

Weared-out spark plug wires

A bad spark plug wire is one of the most common causes of an engine misfire. This is because bad spark plug wires can compromise the combustion process in the engine. This leads to a decrease in performance, stalling, and misfires. A bad spark plug can also cause a check engine light to illuminate your dashboard.

The most common cause of an engine misfire is faulty spark plug wires. A faulty spark plug wire can short out the metal components inside the spark plug. This can prevent the charge from reaching the spark plug.

Leaky spark plug wires

A faulty spark plug wire is one of the leading causes of engine misfires. This can lead to several problems, including engine sputtering or hesitation when accelerating and excessive engine vibration. The problem can be caused by wear or tear on the wire’s outer insulation, often due to friction and prolonged contact with hot engine components.

The first step to take is to inspect the wires visually. This can be done while the engine is off. Using a rag, wipe off any dirt that might have collected on the plug wires. Look for physical damages as well.