Quote:
Originally Posted by ConnClark
You did not fail for a safety reason
An exhaust leak by itself is not a safety issue unless it leaks or is directed into the passenger compartment.
You failed because it was not possible to give an accurate emissions test. In the US emissions are measured on a grams per horsepower ratio. If you have an exhaust leak it allows some emissions to escape their collection and detection instruments. This will reduce the grams per HP measured and if a big enough leak occurred it would allow a car that would fail to pass.
Moral of the story: if you can make a big enough leak that they can't detect or fits in a loop hole you will always pass.
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On the saftey thing, True but not. It boils down to local regulations. In utah I CAN and HAVE failed cars for exhaust of saftey. If the exhaust does not exit the passanger compartment of said vehicle it fails.
Now onto emission test, the computer gives you parameters of pass and fail. On dyno they give you Hc's, co's, O2, co2's and nox, on OBD2 it is all plug and play. I have seen many cars run like crap and they passed both test! can I do anything about it.....kindof.
Like Daox said, if you are concered about lowing your total emission have a 5 gas test run. That will give you accurate readings (for those speeds) of your vehicle output.
P.S. My old 85 ford f-250 pickup run on a dyno (I don't have to do it that way) puts out less pollution then most 2000 plus vehicles. My nose tells me it runs like crap but the dyno says it runs like a dream
