How Does a Fuel Injection Flush Work?

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Fuel injectors, as their name implies, are responsible for getting fuel into the engine. Fuel injection systems either work via a throttle body containing as few as 2 injectors, or go straight into the port with one injector per cylinder. The injectors themselves spray gas into the combustion chamber like a spray bottle, allowing the gas to mix with air before ignition. The fuel is then ignited and the engine keeps on moving. If the injectors become dirty or clogged, the engine cannot run as smoothly.

Performing a fuel injection flush can remedy issues with power loss or misfiring, or can simply be done as a precautionary measure. The process involves flushing cleaning chemicals through the fuel injectors in the hopes of clearing out debris and ultimately improving fuel flow. This service has stirred up a bit of controversy, with some claiming that a fuel injection flush is not worth the effort. With the cost of fuel injector replacement being as substantial as it is, a service that can remedy fuel injection issues or at least assist in diagnosing an issue can be extremely useful.

How do fuel injectors get dirty?

Whenever an internal-combustion engine is powered down, the combustion chambers have leftover fuel/exhaust hanging around. While the engine cools, the vaporized gases settle on every surface in the combustion chamber including the fuel injector nozzle. Over time, this residue can reduce how much fuel the injector can deliver to the engine.

Residue and impurities in fuel cause the injectors to clog as well. This is less common if the gas is from a modern gas pump and the fuel filter is functioning properly. Corrosion in the fuel system can clog the injectors too.

Does your car need a fuel injection flush?

Believe it or not, a fuel injection flush is most often performed for diagnostic reasons. If flushing the injectors in a car that is experiencing fuel delivery problems yields no results, the mechanic can mostly rule out a problem with the fuel injectors. If your vehicle is having issues that may be related to the fuel injection system or if it is just starting to show its age and has noticeably lost power over time, a fuel injection flush would be beneficial.

As a repair type of service, a fuel injection flush is not very effective unless the problem is specifically debris in or around the fuel injectors. Once the injector is malfunctioning then it is likely too late. If the problem is more serious than just debris, then the injectors can be removed and cleaned much more thoroughly via ultrasound. This process is very similar to how jewelry is professionally cleaned. An added bonus of this is that the mechanic can test the fuel injectors individually before they are put back into the engine.

If the injectors are not working properly and there is nothing clogging them, then the problem injectors have to be completely replaced.


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Recent Fuel Injector Replacement reviews

Excellent Rating


YourMechanic Fuel Injector Replacement Service

Average Rating

4.9/5

Number of Reviews

154

Rating Summary
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Matthew

32 years of experience
734 reviews
Matthew
32 years of experience
Mitsubishi Raider - Fuel Injector - Newport News, Virginia
Great Mechanic!!! Work was complete in a very timely manner. Much easier than having go through the gymnastics of having a dealership perform the work.
Dodge Avenger - Fuel Injector - Norfolk, Virginia
Matt is great! Super knowledgeable and helpful. Not pushy at all and gives you his honest advice on what'd he'd do for his own car. Definitely recommend and will be using him again!

Zachary

8 years of experience
43 reviews
Zachary
8 years of experience
GMC Yukon - Fuel Injector - Hockley, Texas
Nice guy, friendly and courteous. He did good work. While it did not fix the overall issue with the car, what he was tasked to do was done well and knocks off a possible cause of my misfire. Thanks Zachary!
Jeep Cherokee - Fuel Injector - Cypress, Texas
Zach was on time, fixed the diagnosed issue and pointed out another problem, which could have resulted in a major safety issue if not repaired. He was not scheduled to work the rest of the day, but fit me in and got my car back to good condition! Thanks Zachary.

Joseph

19 years of experience
458 reviews
Joseph
19 years of experience
Jeep Grand Cherokee - Fuel Injector - Clearfield, Utah
Joseph was very knowledgeable on what was going on and let me ask questions about anything he was doing or if he had any ideas on what to do. He did help me cut down the price because I didn’t need as much work as a shop told me I needed which of course was very helpful. Honesty is my favorite trait. I would highly recommend this service and Joseph to anyone. I even scheduled my appointment and was fit in that day. It’s very helpful having an expert come to you then you try and find an expert. Best service I have found, I’m not gonna use a shop again if I don’t have too.
Mazda Tribute - Fuel Injector - Bountiful, Utah
He was patient with all of my questions and waiting for the part to come in the mail. Did not make me feel stupid. He was very respectful. A good guy

Chris

21 years of experience
1719 reviews
Chris
21 years of experience
Mercedes-Benz CL550 - Fuel Injector - Huntington Beach, California
He was very knowledgeable of what he was doing he explained everything to me and what the step were very good on thing he was doing

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