by dh4ever » Tue May 29, 2012 3:14 pm
those numbers relate to the vehicles being driven, when the program started in what, 92? most of the vehicles on the road at that time were from the 80's and 70's, how many were effecient fuel injected vehicles? how many had dual or tripple cats? how many had O2 sensors? now look at it, as you drive look around for older vehicles, its getting harder and harder to find a vehicle before OBDII, which has a better control system to notify drivers of isues, and even newer vehicles won't even run properly untill you repair the issue, the one in 15 car, previous to OBD2 is not going to be the MAJOR reason for CO2 emissions, it will be like others have said the large equipment, did you know city buses dont alway use deisel, it isnt uncommon for them to suplment it with bunkerfuel, which adds alot more emissions. as the years progress, vehicles have become even more effiecent, even a poorly running car now a days, VS a 70's car running right, your still going to have less emissions. but the 70's car will pass vs a malfunctioning modern car.
Another example, my Jeep that I bumped to a 4.7L engine size (because it has a stroker motor) passes aircare easily, my MR2 repeatedly failed on aircare, I still am not sure as to why. but, the jeep produces twice the emissions, with half the fuel economy, yet its easier to pass it? it polutes more, but aircare cares more about the mr2, the more efficent less poluting engine? the system has many flaws, and as vehicles become more computer controled, it takes more of the "Ted in the shed" mechanics out of the equation, which is a major reason aircare first came in.