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Distributes air to the engine's cylinders

Component that directs air and fuel into the engine's cylinders

The valve that allows air and fuel into an engine cylinder

Air Flow Meter. the silver box next to the air cleaner box on the fuel injection model buses . it measured the volume of air entering the intake system, and allowed the computer to adjust the amount of gasoline required.

Exhaust Gas Recirculation. One of the emission control techniques, in which gases are sucked from the exhaust pipes (before the muffler) and re-circulated through the intake manifold (to be 'burned' again). the high heat associated with exhaust gases required expensive metals ... so replacing/repairing this system can be costly.