Cd -
Quote:
Originally Posted by Cd
I guess I'm not understanding how this all works. A sniffer gets placed at the end of the tailpipe and measures the amount of pollution right ?
If there is a pretty good size hole somewhere in the exhaust system, the reading will be off because a lot of the pollution is spewed out the hole - is that right ? 
Since the test is supposed to be done over*, why are the results absolutely identical ? I wanted to stress that even the RPM was identical in the second test - is this just a generic number or were they really testing both times at exactly 2,591 RPM ?
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I'll take a guess on the assumption that the exhaust leak was after the catalytic converter. The "proportions" of pollutants were the same at the exhaust leak and the muffler tip, therefore the readings were the same for both tests.
If the test measured the "pressure of the exhaust", I think that specific number would be different.
Does that make sense?
CarloSW2