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In Ashburn, people who book through CarAdvise save $190 on average for Fuel Injector Replacement. Lock in this price now.

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National average cost of a Fuel Injector Replacement
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What is a fuel injector and how does it work?

A fuel injector is a valve that allows a precise amount of fuel to enter the combustion chamber in your engine. In order to operate, an engine has four basic needs: fuel, air, compression, and a spark. The first of these, the fuel, is drawn from the fuel tank and pressurized by the fuel pump. When the fuel reaches the engine, the fuel injectors act as the gatekeepers. Electrical impulses from the engine’s computer activate the injectors so that they open and close at just the right times and atomize precisely the right amount of fuel into the combustion chambers. There is typically one fuel injector per cylinder. Internally, a fuel injector has multiple moving parts that allow it to function. These include an electrical solenoid, spring, plunger, and spray nozzle.

How do I know if my vehicle needs a fuel injector replacement?

Fuel injectors need to open and close many times per second to allow the correct amount of fuel to be atomized into their respective combustion chambers. But over time, carbon byproducts of the combustion process and debris from dirty fuel tend to plug up the injectors and cause them to fail. When they do, you might notice one or more of the following signs

Your engine idles roughly or misfires

The throttle hesitates

Lack of engine power

Sharp reduction in fuel economy

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How is this service performed

How is a Fuel Injector Replacement done?

To replace the fuel injectors in your engine, a mechanic will often need to remove the engine cover and depressurize the fuel system. Depending on your vehicle make and model, the mechanic will follow these general steps

  • Depressurize the low pressure fuel system
  • Depressurize the engine’s direct injection (DI) or high pressure system, if so equipped
  • Remove the fuel pressure line and the fuel rail
  • Remove the faulty injector(s)
  • Reinstall the fuel rail and pressure line
  • In some cases, bleed the air from the fuel system before operating the engine

OTHER QUESTIONS CUSTOMERS ASK

Are fuel injectors worth replacing?
Fuel injectors feed your engine with precise amounts of fuel, which allows it to operate efficiently and with adequate power. If an injector is bad and cannot be cleaned and reused, it must be replaced. Otherwise, your engine will lose fuel efficiency and performance. It may also fail an emissions test. You will likely spend more at the pump. And your engine might quit working altogether. Fuel injectors are certainly worth replacing.
Is it better to clean or replace fuel injectors?
As a general rule, replacing an old, high mileage part with a new one is better than simply cleaning and reinstalling the old part. However, the cost of fuel injectors on some vehicle makes and models can be extremely high. When purchasing new fuel injectors is cost-prohibitive, fuel injector service performed by a qualified technician is a worthwhile investment.
What happens when one injector fails?
When a fuel injector fails, it will no longer allow fuel to enter the combustion chamber the way it should. It may shut off completely, or it may atomize less fuel than called for. When this occurs, that injector’s cylinder will make less horsepower than the rest, which can cause a vibration and misfire in the engine. The condition can often be detected with a scan tool connected to the vehicle’s diagnostic data port. If severe enough, you might notice by simply listening to the engine while driving. Not only might the check engine light come on or the engine shake, but your engine will lose fuel efficiency and power.

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