With direct fuel injection, each cylinder gets its own injector, which sprays fuel directly into the combustion chamber at just the right time to combust. With ported fuel injection, instead of spraying the fuel directly into the cylinder, it sprays into the intake manifold just outside the valve. When the valve opens, air and fuel enter the combustion chamber.
Relays are extremely useful for handling high-amperage electrical accessories like large electric fans, fuel pumps, and HID headlights. They are activated by an electric coil and controlled by a switch. When the relay is closed, no power goes to the accessory in question. When you flip the accessory switch, an electric coil in the relay opens, sending power to the accessory.
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