The nozzle through which fuel is injected into the in-take manifold is known as the injector. The geometry of the valve and seat of the injector is designed so as to inject fuel in a fine, cone-shaped spray. In electronic fuel injection systems, the valve is opened by a solenoid and closed by a spring. Modern-day injectors are controlled by a car's ECM. Injectors often need to be specifically modified to prevent them gumming up on poor quality Indian fuel. Honda, for example, gets around this problemby using two-pin nozzles per injectoron its successful City model.