I passed emissions!

Just to let everyone know, my 91 Civic passed emissions with flying colors! The new cat dropped my CO, hydrocarbon, and oxides of nitrogen down to practically nothing. A dramatic difference! Even though carbon dioxide
levels don't count they do measure them and they were way down as well.
Hopefully I can drive the Civic until my van is paid off. :) My daughter is 13 and it would be a great car for her to learn with.
Just an aside...even though emissions testing is a pain I wholeheartedly support the program. I think Maryland's plan is fair - $14 for the first test, if you pass you're good for two years. If you fail the second test is free and they give you a list of troubleshooting ideas. Subsequent tests are $14 and they end up giving you something like 6-8 months to correct the problem. If it still won't pass you can get a 2 year waiver if you can show repair receipts for at least $450. Sure it costs money, but if you pass (like most people do) it's $14 every 2 years. A paltry sum when you consider the benefit to the environment. If you fail you may have to spend a few bucks, in my case about $350. But I did get a tuneup and a new cat out of the deal. My car's running great and I've minimized my contribution to air pollution. Win-win.
Thanks again for all the help from the folks here at alt.autos.honda!
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testy wrote:

If I remember correctly, CO2 is measured to indicate if there are significant exhaust leaks in the system. CO2 is a normal product of burning a hydrocarbon. If the levels are too low, then it indicates that there's a leak and that the other numbers are probably artificially low since not all of the exhaust gasses are reaching the test station's probe.
Eric
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CO2 is an indication of good combustion. You want HIGH numbers. In the ASM2525 tests common in North America, CO2 is used as a datum.

That's called "dilution". That's where ambient air characteristics are compared against exhaust gases. It's pretty complicated. http://www.pacode.com/secure/data/067/chapter177/subchapFtoc.html
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Numbers please! ppm and %, before and after.
I have a vested interest in this, since after nearly 250K miles my cat's toast. I passed by ONE (1) ppm on NO two years ago. HC ond CO were still very low.
Next test for me is this summer, and I expect to fail with my original cat.
Did you use an aftermarket cat, and if so, how'd it fit?
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Sounds like the smog test in California about 10 years ago - no big deal as long as you took basic care of your car. Today, it is obnoxious. There are different types of tests, testing stations and at a cost of $50 per test pass or not. Lots of fraud in the past that has been addressed by more procedures. To appease new car buyers, DMV allows for a "smog abatement fee" in lieu of a smog for the first 5 years of a new car. Smog cert (or abatement) became a revenue source for the state instead of a clean air initiative - I hope MD stays simple...
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