Quote:
Originally Posted by racprops
It has been reported because our cars are required to run cats, there are programs in our PCMs to feed them, that with a lean burn cats will go cold due to lack of fuel to light them up. So they prevent this from happening.
|
Is it a conspiracy or just the fact that going lean and using less fuel also means making more NOx emissions?
This is what killed the diesel car. It's a great fuel efficient engine, but there's a sort of tug-o-war between better efficiency and better NOx emissions. You need fuel in a catalytic converter in order to reduce NOx to CO2 and N2. The VW diesel scandal was the result of the engine squirting unburnt diesel fuel down the exhaust during testing and not doing it during normal driving. As a result the car got 60mpg, but terrible NOx emissions.