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.
A wiring harness in the engine is a set of wires, connectors, and terminals which run all over the vehicle for relaying electric power and information. The harness plays an integral role in connecting a number of important components of a vehicle. The wiring harness is just like the central nervous and circulatory system of a human body which pass information and power throughout the body.
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