The fuel injector is a device that sprays fuel into the cylinder of the engine to initiate the internal combustion process.

There are a few issues which can arise that will alert you that it is time to replace your fuel injector. One of them is a problem associated with turbocharged engines. This is caused by dirty injectors which cause a leaning effect, thus leading to engine damaging detonation. The other cause for a replacement is contributed by both long term and short term fuel trims. This may be caused by clogged injectors or a drop in fuel pressure below the required amount.