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Yes and I think they still have them. It sound like kind of a dumb thing to me. The way it was explained to me is that it doesn't really make anything really happen.
When you start a car, any car, well any fuel burning car, he emissions are higher when the engine is cold, right? Everyone knows that, you have to enrichen the mixture, in the old days there was a choke, on a modern car it's no different, they just inject more fuel, and gradually as the engine warms up, you start to open the choke or the mixture is leaned out on a modern fuel injected car.
Well, what the air pump does is to put more air in to the exhaust so that the feds are happy that the parts per million of (whatever they want to be at a certain level) are acceptable. In other words they are "diluting" the exhaust stream with air from the pump. The amount of pollutants are the same, it's just that the "sniffer" is happy because of the added content of air from the pump. Figure that one out.
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