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Most air injection is pretty similar, What air injection does is it forces air into the exhaust to help the catalytic converter burn more of the unburned fuel in the exhaust to reduce emissions. The air injection pump is powered by the vehicles drive belt most of the time, rarely its electronic. The pump draws in ambient(outside) air, compresses it slightly, and releases it, usually into the exhaust manifold, directly into the exhaust stream, adding more oxygen to the exhaust, and essentially, helping the catalytic converter retain more heat so that it re-burns the unburned fuel before it gets back out in to the atmosphere.
It works the same way a fire does, either in a fire pit or fireplace, when you have small coals, or embers, in a fire, if you fan, or blow air on to them, they start to heat up, and eventually turn in to flames. Fire can't survive without oxygen, and the Air Injection System helps to keep the air around us cleaner.
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