Vincent Cheng Hoi Chuen wrote:
Ashton Crusher wrote in
:
That's my point for this thread branch, yes. Not only isn't it worth
it, the code is none of teh EPA's damn business.
What I don't understand is that the code, apparently, allowed *more*
fuel to the engine (to cool the combustion chamber) which lowered NOx
emissions.
So, fixing the problem should result in *less* fuel to the engine, if
that's the case.
When they reflash the ecu, wouldn't that lowering of fuel *increase* gas
mileage *and* bring NOx emissions back down to where they said they were?
Backwards.
Less fuel = hotter burn in the combustion chamber = higher NOx numbers
It shows up as vehicles that get better EPA mileage numbers than the
sticker says because they are burning less fuel.
To correct the issue they need to increase the fuel to the engine to
cool the combustion temperatures.
The end result will be that the EPA MPG numbers will be closer to
reality because the engine is now using the fuel to keep the NOx numbers
down. The only "bad" side effect will be that the particulate trap and
the NOx catalyst will need to burn more often to regenerate.
OR VW could come up with a DEF retrofit to drop the NOx numbers.
--
Steve W.