Something that is generally worthless and contribes nothing (IMO).
What they do is pump clean air into the exhaust stream which
allows any fuel that wasn't burned in combustion to be burned
off. Strictly an environmental thing. Kalifornia had the toughest
laws concerning emissions, and smog pumps (along with other
equally useless stuff) were required on cars sold here since 1972
Catalytic converters are a similar critter. The platinum plated
pellets or wires promote burning of unburned fuel in the exhaust
They reduce levels of carbon monoxide, hydrocarbons and nitrogen oxides,
they require the engine to run lean enough to to still contain oxygen in the
exhaust gasses to work properly. And ofcourse it must be using lead free
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