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A diesel injector is a device that injects diesel fuel into the combustion chamber of a diesel engine. It is responsible for the amount of fuel injected, the timing of injection and the injection pressure. Diesel injectors are important components of the diesel engine and can affect engine performance, fuel economy and emissions. [Image of Diesel Injector] There are two main types of diesel injectors: constant pressure injectors and common rail injectors. Constant pressure injectors use constant fuel pressure to inject fuel into the combustion chamber. Common rail injectors use a common pressure rail to deliver high pressure fuel to the injectors. Diesel injectors are usually located in the engine cylinder head. They are connected to the fuel rail by fuel lines. The injectors are controlled by the engine control unit (ECU). The ECU receives signals from various sensors, such as the throttle position sensor, rail pressure sensor, and coolant temperature sensor. The ECU uses these signals to determine the amount of fuel to inject, the timing of the injection and the injection pressure. Diesel injectors can wear out or deteriorate over time. Symptoms of a faulty diesel injector may include: * Power loss *Startup problems * Unstable slow motion * Increased fuel consumption *Holes on acceleration * Increased black smoke If you notice any of these symptoms, it is important to have the diesel injectors checked by a qualified mechanic.