Originally Posted by
pizzaguy
Well, then I don't understand the function. What I read was that it provided extra air (oxygen) in the
exhaust to cause the cats to react more intensely, in order to heat them up faster.
Yea Mark, that's the purpose on any car that has a secondary pump, heat up the cats quicker on a cold start so it can go closed loop quicker and therefore cut down on overall emissions.
At least, that's what I learned in shop class back in 1961 when they were dreaming about the days when we could go all digital on engine control and stop greenhouse effect. ( NOT )