Quote:
Originally Posted by elp_jc
An air injection pump's job used to be that of burning fuel on decel on carbureted cars. Have no idea what the hell that thing is doing on a modern fuel-injected engine... and working at idle  . |
My understanding is that they deliberatley run it a bit rich on cold startup and then add excess air. This means there is a lot of reacting going on in the catalyst which heats it up faster.