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How To Test Diesel Fuel Injectors For A Smooth Running Engine

How To Test Diesel Fuel Injectors For A Smooth Running Engine

The fuel injectors at some point are likely to be worn out just like any other parts of the car. When this happens, you need to know how to test diesel fuel injectors. This is important to determine if the fuel injectors are the problem or there is something else going on. The fuel injectors can get dirty when the hydrocarbons and other additives get attached to it. This is all part of the fuel system as it is bound to get dirty. In worst cases, you can end up with leaky fuel injectors easily.

Diesel injector leak symptoms

When the diesel fuel injectors start to leak, you are likely to spot the following symptoms.

–    You are bound to notice an increase in fuel consumption due to poor performance of the injectors

–    The car will have poor idling

–    You will notice fuel odor inside and around the car generally

–    Cases of hard start

–    Poor emission results from the tests

–    Cases of oil thinning that could lead to having an engine failure

How to test diesel fuel injectors

–    Before you can start working on the car to test the fuel injectors, make sure to put on the appropriate gear for safety. You have to always protect yourself from injury. For this job, you will need the safety glasses to keep the debris from getting into your eyes. You could also get gloves when you do not want to handle grime directly.

–    Open the hood of the car to locate the fuel injectors of your diesel car. The easiest way for you to locate the injectors would be checking the service manual specific to your car. In most cases, you will get a car having a fuel injector for each of the cylinders. They would be then located on the intake manifold and then connected to each other with a fuel rail.

how to test diesel fuel injectors

–    To test the injectors, you will need a long screwdriver or metal rod. You will need a foot-long screwdriver or around there so that you can reach the injectors and listen to them. A thin piece of rebar could also work fine to help you by listening to the injectors.

–    Using the tip of the screwdriver, place it on the fuel injector. The metal rod will be used to transmit the sound from the injectors to the ear. This prevents you having to come in close contact with a hot running engine. Hold one end of the screwdrivers on the injector and then the other end of your ear.

–    Listen for a clicking sound from the injector. As the engine keeps running, the injectors give off a clicking sound. This clicking sound means that the injector is activated and it is working properly. If there is no sound coming from the injector, then it means that your injector is not working correctly.

–    You have to be careful when doing this part to keep your head from getting close to the engine. If you have long hair, then you might want to keep it tucked to prevent any accidents such as it gets caught in the moving parts in the engine bay.

–    Once you have listened to the clicking sound from one injector, move onto the next one. You have to check all the injectors to make sure that they are all working. If you find one or several with no clicking sound, then mark it for further inspection. Sometimes it could be an issue with the electronic control, so further inspection is needed.

–    For those who might have an OBDII scanner and the check engine light is on, scanning for errors might come in handy. Scan to see if the codes show anything related to the injectors or cylinders. Replacing the faulty injector could help with resolving the problem, but you also need to take the car to the mechanic if the problem persists.


–    Always make sure to wear the appropriate clothing when working in the engine bay

You need to make sure that you have the best fuel injectors working at all times. Since it is inevitable that injectors are bound to fail at some point, then you need to know how to test diesel fuel injectors. Make sure to get yourself the right kit for your testing the injectors in your engine.

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About The Author


I have a diploma in mechanics, and I am absolutely in love with the motor . I share my love of this genre through my blog and videos. I enjoy hearing from you, share your car problems, share ideas, and I will give you the best advises how to solve your car problem. You can find I Love Engineering across social media at: @bellailoveengi1. Shoot me an email at [email protected]

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