January 6th, 2009
Dear automotive expert,
I have a 1986 BMW 528E which failed only the Emission Test Results as follows:
Vehicle Reading HC 0.55 gpm CO 12.11 gpm NOx 3.41 gpm
Test Limits HC 0.80 gpm CO 15.00 gpm NOx 2.00 gpm
What needs to be changed to pass emission control test?
Thank you for your help.Dear Harry Alain,
Thank you for your question.
As you could see from the test, three pollutant elements are examined:
Hydrocarbon (HC), Carbon Monoxide (CO) and Nitrogen Oxide (NOx). Two
of them are bellowing the limit.
NOx stands for the level (in grams per mile, gpm) of oxides of
nitrogen. The meaning of the test, is that your vehicle emissions of
nitrogen oxide are too high. This can be caused by anything that can
rise the temperature of the combustion, most commonly a problem in the
exhaust gas recirculation system. High NOx emissions could be also the
effect of many other problems, such as problems in the computer
control system or in the three-way converter.
So, to answer your question, you need to fix your NOx emission in
order to pass the test. I don't know if it comforts you or not, but it
is estimated that about 20% of the pre-1990 vehicles fail because of
that.
There are ways to repair NOx failure - this should be done by a repair
technician (mechanic) not by-yourself. However, I'll post here several
pieces of reading material on how to deal with NOx failures:
Wisconsin Department of Transportation, "NOx Emission Repairs: You
Have The Power!" PDF Document (you'll need an "Adobe Acrobat Reader"
to read this file. This could be downloaded for free at
www.adobe.com), http://www.wivip.com/3_5_1.PDF
Larry Carley, FIXING EMISSION FAILURES, 2000
CarleSoftware.com http://www.babcox.com/editorial/bf/bf69920.htm
rec.autos.tech - http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&group=rec.autos.tech
- a discussion group on cars and their problems.
I hope that answered your question. I used an internet search, with
terms such as
to find answers and sources for you. Please contact me if you need any
clarification. I'd be pleased to clarify my answer before you rate it.#If you have any other info about this subject , Please add it free.# |
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