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Because the port fuel injection sprays the fuel right onto the back of each intake valve. This means each cylinder is getting the exact same amount of fuel as the rest which helps with fuel efficiency and the amount of power created. Whereas the TBI (throttle body injection) has only one or two large fuel injectors spraying down through the throttle plate and into the intake manifold. Then the fuel just kinda gets sucked into each cylinder and usually goes for the cylinder that is creating the most vacuum.

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Q: Why is port fuel injection better than throttle body injection?
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