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Cylinder Misfire Causes: Everything You Should Know!

Cylinder Misfire Causes: Everything You Should Know!

What is an Engine Cylinder Misfire?

 


When your car misfires, this means that the internal combustion in your car is not working correctly. Even with the misfire, your car will still be able to run and function, but you might notice that the performance is subpar and leads to jerking while accelerating and problems with smooth driving. Diagnosing the cylinder misfire causes can reduce any performance issues. 

 

Along with the jerking, while accelerating, the engine cylinder misfire can be due accompanied by exhaust smoke coming out of the tailpipe, the smell of fuel, and loud sounds coming from underneath the hood. If you notice these symptoms, then you are more likely to have a cylinder misfire. 

 

As soon as you notice this occurring in your vehicle, you must find out the cylinder misfire causes to fix the problem right away. If you let the symptoms continue without addressing the issue, then you could end up paying for an expensive repair or replacement shortly. 

Cylinder Misfire Feel and Sounds

 

The engine misfire will be noticeable to the driver as soon as it starts happening. The driver might notice that the engine will feel shaking, vibrating, and jerking while accelerating. After this happens, the engine will be able to get back up to speed but suffer from performance hindrances. Since these cylinder misfiring symptoms are obvious to drivers, you should be able to seek help as soon as you notice the issues. 

 

When you notice the engine performance begins to suffer, this means that at least one spark plug is not firing at the right time. When the spark plug timing is off, this causes the cylinder misfire. Even though your car might still move and drive at a certain level, you will notice an increase in the emissions, a lack of power, and a lag during acceleration.

 

If you press on the gas pedal and it takes a long period for your car to speed up, this means that you have a cylinder misfire. As soon as this happens, you should look into the cylinder misfire causes to address the root problem. If you do not fix the issue, your engine will continue to require more fuel than necessary, leading to a higher gas refuel cost, higher emissions rate, and a lower fuel economy.

 

Also, the driver may notice the sounds of the engine misfire. The sounds coming from the engine are usually some of the first symptoms that you may see when it comes to the cylinder misfiring. In some vehicles, you might notice this sounds like a low chugging sound, while in other cars, you might hear a loud banging noise. 

Cylinder Misfire Causes

 

To fix the cylinder misfiring issue, you need to know the part or parts that cause this problem in your vehicle. There are many reasons why your vehicle would misfire in the first place, so you need to narrow down the culprit to diagnose and remedy the problem quickly. Finding the cylinder misfire causes as soon as possible can prevent any serious repairs and replacements in the future. 

 

  • Air to Fuel Ratio

 

An imbalanced air to fuel ratio in your engine can lead to the cylinder misfiring and performance hindrances in your vehicle.  If the air to fuel ratio is off within the engine, this leads to the internal combustion’s wrong timing. If there is too much fuel or too much air in the engine, then the imbalanced ratio causes a cylinder misfire

 

For the internal combustion to occur at the right time and adequately power the engine, the mixture requires more fuel than air. If there is too much air in the engine, the cylinder will misfire during idling, but remedy itself as you continue driving. If you notice that the engine misfires only while idling, then you need to bring your car to a mechanic so they can look at the ratio of air and fuel. 

 

Some common reasons why the air to fuel ratio might be off in your vehicle is a clogged fuel filter, damaged airflow sensor, or a faulty fuel pump. The fuel pump is a critical component of your car, pumping fuel from the gas tank into the chamber to transfer the right amount of fuel to power the vehicle. Also, the fuel filter has a vital function of filtering the fuel by removing all contaminants. Finally, the airflow sensor analyzes the airflow in the engine and sends this data to the engine control unit. If any of these parts are not working correctly, these can be noticeable cylinder misfire causes. 

 

  • Ignition System

 

When determining the cylinder misfire causes, the ignition system should be one of the first places you look. There could be an issue from the spark plugs, ignition coils, ignition cables, or any seals and connections in the ignition system. If any of these problems are present, the internal combustion will not contain the proper air and fuel ratio. 

 

One of the most common cylinder misfires causes originating from the ignition system is a weak spark coming from the spark plugs. In this case, the weak spark can cause the engine misfire, leading to jerking while accelerating. 

 

  • Transmission

 

Unlike the previous cylinder misfire causes, there are certain instances when the cylinder misfire might not originate from the engine. The engine misfire could result from a transmission issue that causes your car to jerk while driving, stall when shifting, and stutter while moving through the gears. If you notice these symptoms while driving at faster speeds, then the transmission could be the culprit for the cylinder misfire. 

 

  • Mechanical System

 

As you know, your vehicle consists of various mechanical parts that lead to the engine’s proper functioning and the transmission. These main parts are the piston rings, camshaft, cylinder valves, and cylinder walls. If one of these parts becomes damaged or worn down due to consistent use, this can lead to a cylinder misfire. 

 

Along with these parts succumbing to prolonged wear and tear, a blown head gasket, head gasket leak, or intake manifold gasket leak could be the potential cylinder misfire causes. A cylinder head gasket is in charge of sealing the engine block’s cylinders, preventing any liquids from leaking out of the engine and preventing any contaminants from getting inside. If the gaskets are damaged, these faulty parts can be the main cylinder misfire causes.

 

  • Engine Control Module

 

Sometimes, the drier might notice that there would be an issue with the engine control module – also known as the brain of the computer. This engine control module controls the engine and manages the functions, ensuring the engine can run at an optimal level. Any minor issue within this part can easily lead to improper timing in the combustion engine and lead to an engine cylinder misfire

 

However, luckily for drivers who notice this cylinder misfire cause, there is an easy fix to this issue. If you, or a trusted mechanic, disconnect the battery and then reconnect it, you might notice that this simple re-start of the battery can fix any glitch within the computer system. Unfortunately, suppose the engine control module is still not functioning correctly after this “fix”. In that case, you should bring your car to a dealership or mechanic to see the main cylinder misfire causes. 

Diagnosing Cylinder Misfiring Code

 

Now that you know the causes of the cylinder misfiring in your vehicle, you now need to know how to quickly diagnose the main cause of the issue so you can efficiently fix the problem. In certain cars, the OBD-II system can accurately identify engine misfiring, coil problems, and injector issues. 

 

In cases where you notice the cylinder misfiring, but there are no diagnostic codes present when doing diagnostic testing, this can mean there is a problem in your car that is not yet severe. However, you still need to determine the cylinder misfire causes to prevent it from getting worse. In most cars, this issue directly relates to the ignition system and the fuel delivery system. 

 

These ignition and fuel delivery systems include a damaged fuel injector solenoid, a broken ignition coil, or a dirty fuel injector. These cylinder misfire causes may not set off a diagnostic code but will need to be fixed to prevent the cylinder misfiring from getting any worse. 

 

Another common cylinder misfire cause is bad spark plug wires. Just like any other part, the spark plug wires can break down over time and after consistent use. After nearly 50,000 miles, the spark plug wires might leak current, causing a short circuit before the spark can set off the ignition at the right time. To check if this is the culprit, you will have to check the resistance of the wires. 

 

  • Bad Spark Plugs Code

 

 

If you get a diagnostic code, it will show up as code P0300-P0312. Using your diagnostic tool, finding this code means that one of the following has occurred in your car and requires immediate attention:

 

  • Damaged spark plugs
  • Faulty ignition coils
  • Broken o2 sensor
  • Bad fuel injector
  • Damaged exhaust valve
  • Faulty catalytic converter
  • Blocked EGR valve
  • A broken camshaft position sensor
  • Malfunctioning computer

 

If you notice any of these problems in your vehicle, the spark plugs and other electrical issues might be the main cylinder misfire causes. 

 

  • Finding the Cylinder Misfire

 

If you have a consistent engine cylinder misfiring, the first step is isolating and finding the misfiring cylinder before it continues to harm your car. When diagnosing the engine misfiring, you need to find the weak and damaged cylinder. 

Disconnecting Wires

One of the most basic ways to do this is by disconnecting each one of the spark plug wires while your car is idling. You can do this yourself, as it does not require any extra equipment or specific mechanical knowledge. Once you find that the car remains idling at the same speed, you have found the damaged cylinder. 

Power Balance Test

Another way to find the cylinder misfire cause is by performing a power balance test. However, this is a little more tedious and might require you to bring your cat a mechanic, as this test needs an engine analyzer. The power balance test provides a safer way to find the cylinder misfire cause. This test keeps you away from any electrical currents and prevents further damage to the electoral system in your car. 

 

  • Compression Related Cylinder Misfiring

 

During your diagnostic testing, you might have isolated the misfiring to just one cylinder. If the spark plug is cracked or broken, you have narrowed down the cylinder misfire causes. However, if the spark plug physically seems to be intact but is wet from leaking fluid, you need to inspect the wire for damage. If the wire resistance exceeds the specifications, then you have found the misfire source.

 

  • Fuel Related Cylinder Misfiring

 

If the ignition components, such as the spark plugs, are fine and working correctly, then the fuel system is the main culprit for the cylinder misfire. The first place to start diagnosing the problem starts by checking the voltage at the fuel injector and ensuring the injector does not make any loud sounds during use. 

Conclusion

 

To find the main cylinder misfire causes, you must know what a cylinder misfire sounds and feels like as the driver. By noticing the main symptoms of the cylinder misfiring and the typical engine misfire causes, you can quickly diagnose and find the root problem that is causing this performance issue in your car. 

 

Diagnosing the problem can ensure you pinpoint the damaged component causing the cylinder misfire, ensuring that your engine runs at an optimal level and meets all performance standards. Quickly determining the faulty part causing the cylinder misfiring can keep your car running safely, prevent any further issues, and reduce necessary repairs and replacements in your car in the future!