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Old 07-30-2002, 06:27 PM
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dpetryk dpetryk is offline
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
How do I fix high NOx levels.

My 91 420 sel failed the NOx portion of the emissions test. All the other emissions were well within specified limits. Does anyone know which emission related component is most responsible for the control of NOx? I suspect that the problem is related to the EGR system. How do I approach the problem and figure out what needs to be fixed?

My test results were:

allowed actual
---------- --------
HC 103 13 (hydrocarbons)
CO .57 .05 (carbon monoxide)
CO2 na 14.7 (carbon dioxide)
O2 na .1 (oxygen)
NOx 712 924 (nitrogen oxide) FAILED
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