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What are the Symptoms of Bad Fuel Injectors?

Update:26 May 2021

The fuel injector is an important part of the car engin […]

The fuel injector is an important part of the car engine, which can deliver fuel at the right time to ensure clean and efficient combustion. However, if regular maintenance is not performed, the injector may malfunction or become blocked, so you need to know how to find the signs of a malfunctioning injector and how to fix it.

What is an injector?
The fuel injector uses an electronic control valve to inject fuel into the car's engine, which can be opened and closed multiple times per second. They have atomizing nozzles that evenly distribute gasoline or diesel for optimal combustion and efficiency. The introduction of fuel injectors to replace the old carburetor system, because the fuel injectors can help the engine to run with higher fuel efficiency and help reduce emissions.

Automobiles usually have one fuel injector for each cylinder. Therefore, if you drive a four-cylinder car, you will most likely have four injectors.

How does the injector work?
The fuel injector controls the amount of fuel delivered to the combustion chamber to ensure that the correct amount is injected at the correct time. The process is:

The fuel pump pushes gasoline or diesel through the fuel line to the fuel injector.
The ECU (Engine Control Unit) uses sensors to determine the correct time to inject the injector and inject fuel into the combustion chamber.
When the ECU activates the injector, pressurized fuel is injected into the combustion chamber through the nozzle. Because the nozzle is too small, the fuel is atomized, making it burn more efficiently.
Signs and symptoms of injector failure
Sometimes, the injector may malfunction, which affects its performance or causes malfunction. This is usually because they are clogged with debris, although certain mechanical and electrical problems can also affect the injectors.

Here, we look at some common signs and symptoms associated with malfunctioning injectors.

Check engine warning light
The most common sign of injector failure is to check the engine warning light, which appears on the dashboard. Once the injector does not perform the required operation, this light will be on. (In other words, if you add too much or too little.)

Although there are many reasons to check that the engine light can be turned on, it may be attributed to the fuel injector. When the fuel delivered by the injector is too much or not enough, the ECU will trigger the warning light.

Engine misfire or vibration
Does your car catch fire often? Or, might there be a delay after you depress the accelerator pedal? Both of these symptoms may be caused by a malfunctioning fuel injector, which is most likely a clogged or clogged nozzle.

If the fuel injector cannot provide the fuel dose required by the ECU, the fuel-air mixture in the combustion chamber will be closed, which may cause ignition failure or a sudden drop in acceleration. This is why it is so important to keep the car's fuel injectors clean and free of clogging.

Rough idle
If the idling noise of your car has changed and feels harsher, the injector may not deliver fuel as expected. Like misfires, this is usually caused by clogging of the fuel injector with particles, which can interfere with the atomization and spraying of the fuel.

Several failures can cause severe idling noise, including damaged spark plugs or dirty air filters, but clogged fuel injectors are one of the most common causes.

Engine stall
Does your engine stall or stall randomly without you having to do anything to cause it? This may be due to lack of fuel from the injector to the engine. If too little fuel reaches the combustion chamber, the ECU will stop the engine, causing flameout.

Under normal circumstances, engine stalls caused by fuel injector failure usually occur when the nozzle is severely blocked or fuel leakage occurs at the connection between the fuel injector and the fuel line.

Fuel leak
If you can smell a strong fuel smell while driving and your car shows other symptoms on this list, it may be a fuel leak. A fuel leak may occur where the fuel injector meets the fuel injector. If the fuel injector is old and improperly maintained, a fuel leak may also occur on the fuel injector itself.

By checking the injector, you will be able to determine if there is a leak because there is fuel on or near the injector. You may also notice a drop in the fuel gauge.

Poor fuel economy
A malfunctioning fuel injector may cause a significant drop in fuel economy. This is because the ECU requested more fuel from the injector, but did not receive it in the combustion chamber. The less fuel that reaches the engine, the lower the fuel economy.

When the injector is clogged or leaking, you may experience poor fuel economy.

MOT failure due to emissions
As thousands of cars fail to pass the MOT due to emission reasons, drivers need to make every effort to reduce the harmful emissions generated by the car before the MOT, and to ensure that the clean and well-maintained fuel injectors play an important role in it. This.

When the fuel injector does not deliver fuel as expected, it interferes with the fuel-air mixture in the combustion chamber. As a result, some of the fuel is not burned, which means more harmful emissions are discharged into the exhaust system.

If you want to try to reduce emissions before MOT, inspecting and cleaning the injector is an essential maintenance task.

Maintaining the injector
The easiest way to clean and maintain fuel injectors is to use Redex fuel system cleaners. Our professional cleaning product series can be used in gasoline engines and diesel engines, and can remove particles that may cause clogging from the fuel injector.

If you want to specifically reduce emissions before MOT or just to protect the environment, then it is worth checking out our advanced products and new special emission reduction agents. Watch the video below to learn more about how Redex can help you keep your car's fuel injectors clean and clean.

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