What are the Signs of Bad Fuel Injectors?

October 23, 2025

Close-up of car engine fuel injectors, with connected hoses and tubes. | Auto Clinic Care

If you suddenly notice that your vehicle's gas mileage is dipping, it is time to do something about it. When your car starts to work harder, you will notice its performance falling off noticeably. While many factors can lead to this, you might want to first look at your fuel injectors. They could be dirty and in need of a serious cleaning.



Why Are Fuel Injectors Important?


The fuel injectors in your vehicle are part of an interconnected system. They work together with your fuel filter and pump in order to deliver the gas that your engine needs to work correctly. It will spray the right amount of fuel into your vehicle's intake system at the appropriate time. This must take place at a specific angle for the process to work correctly.

Fuel injectors help to create a perfect mix of air and fuel. Without this, the engine will not get the proper amount of clean fuel that it needs to work efficiently. This is when you will start to notice the performance dropping off, which will eventually result in you paying more than you should at the gas pump.


Symptoms of a Clogged Fuel Injector


One indicator of a fuel injector that is giving you problems is that the engine begins to misfire. You will notice this because the engine starts to sound like it is spitting, and this will cause vibrations throughout the car. The cause of this is a lack of balance between fuel and air that is getting into the engine.

You may also notice that the car runs rough when idling. You might be sitting at a red light and the vehicle begins to shift. This is a symptom of a dirty fuel injector. Another thing you might notice is that the car will not start. While many factors can cause this, it could be something as simple as your fuel injectors no longer being able to deliver gas to the engine.

If you suspect that you have some fuel injectors that need to be cleaned or repaired, stop by our auto repair shop for the assistance you need today.

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