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Discussion Starter · #1 ·
In May, I had my car inspected. I barely passed the emissions test due to my exhaust putting out a high NOx content. I was 3 under the state standard. 1183 out of 1186, I believe my reading was. I checked my EGR hoses for vacum leaks, and there doesn't appear to be any. I also tested the EGR to see if it was functioning properly, per the information found in my Haynes manual. It seems to be functioning fine. When I accelerate, I do hear a slight hissing sound, however; which is a sign of a vacum leak, I would imagine. What else besides the EGR valve could possibly cause high NOx emission?

1993 Nissan Sentra SE-R (5-Speed Manual)
STILLEN Hi-Flow Intake System
STILLEN Performance Exhaust System
15x7 Kosei K1 Silver Racing Wheels
195/50 ZR 15 Dunlop SP Sport 5000 Tires

[This message has been edited by Chris93SER (edited 07-05-2001).]
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