Quote:
Originally Posted by tonupkid
What is this secondary air pump for, what does it do?
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Its a total waste of space, weight and complexity to reduce emissions for a tiny part of any given journey. All it does is blow fresh air down the exhaust to heat up the cats faster by feeding them excess oxygen. I threw it all away on my S8 and maybe one journey in ten the ECU will get in a grump about it, and thats only because it's EU4. FL1 cars with EU3 don't care. Over the life of the car I doubt very much that the tiny impact it has on emissions will come even close of offsetting the extra fuel required to carry around several Kg of pointless junk.
Also, the amount of swearing it evokes when trying to get to anything on the back of the engine (which is all blocked by said pointless junk) probably contributes more to global warming than warming the cats up 60 seconds early ever saved
Its another case of manufacturers making something to pass the test, rather than making any useful contribution to real-world emissions.