Fuel injection systems are a way of delivering fuel to diesel and gasoline based combustion engines. This technique of fuel delivery has become the standard in modern vehicles and is the primary way that fuel is directed to the engine.
Replacing a dirty or plugged fuel injector in your car can fix numerous problems including rough idle, stuttering or slow throttle response. This guide provides you with instructions on how to change your fuel injector to improve your engine's performance.
Open the hood and locate the fuel injectors. These should all be on a rail, on top of your engine. Then find the valve on the fuel line and connect it to the fuel injector tester.
Test the fuel injection system. Use the fuel injection tester to find the pressure readings for each of the fuel injectors. This should allow you to locate the faulty injectors within the system and determine which need to be replaced.
Disconnect the fuel line completely from the engine, so that no more fuel will be pumped into the injectors. Next start the vehicle in neutral and allow it to idle for a few moments, giving the injection system some time to completely clear of fuel.
Next, remove the injector rail. Loosen the screws that hold the injector rail in place against the engine block. This should now give you access to the individual injectors.
Locate the faulty injector and remove the electrical connection, before pulling it out of its seating. Replace this with a new injector and reattach the electrical connection. Repeat this process for all the injectors that failed the initial pressure test.
Finally use the original screws to reconnect the fuel rail to the engine block and reconnect the fuel line. This is now the ideal time to turn on the ignition, leaving the car in neutral, so that you can observe the fuel injectors working.
Once you have completed the replacement work, it's highly recommended to road test your car to ensure that the rough running engine has been fixed.
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