Originally Posted by
stevieturbo
Didnt Saab make a similar claim about their petrol engines a few years back ?
Maybe car owners should charge the government for cleaning up their city air !!
They may have but I doubt it was true lol.
A modern truck engine is very complex. Part of euro 6 is it meets emission levels from as soon as it's started. Ad blue will only work at a certian exhaust temp so until that's met egr is used to meet emission levels but also to warm the engine as well as the turbo being variable vain and there being a back pressure valve all to heat the exhaust gasses. To the point the exhaust can take over. The exhaust has a particular filter a cat and an ammonia filter it's a very clever system. The exhaust after treatment ecu is the trucks master ecu and controls the engine ecu