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Old 08-02-2004, 07:42 PM
chazola's Avatar
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Join Date: Nov 2003
Location: Dorset, United Kingdom
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yay-passed inspection- now what do these numbers mean?!

sorry, just had to share as I was biting my nails all day waiting for my PA inspection test result.

the results were:

CO 0.06 (limit 1.10)
HC 75 (limit 275)
NO 441 (limit 3600)
dilution 8.1%

anyone care to enlighten me on the meanings of these numbers and what they say (if anything much) about the car?

cheers

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1993 320TE M104
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1983 230E W123 M102
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1972 280se 3.5 W108 M116
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Old 08-02-2004, 09:39 PM
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Location: Ontario, Canada
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It means, simply put, your engine, emission controls & catalytic converter are working really well.
To simplify:
CO is directly related to fuel/air mixture, HC readings ( if high ) usually indicate ignition or oil-burning problems, NOX is directly related to the EGR ( exhaust gas recirculation ) valve on an engine.
As I said above, these are as close as I can come to translating your readings into layman's terms.

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