Quote:
Originally Posted by chris_s13
yo my nox level is sill high. seafoam the car, gave her a tune up and installed a new cat with. also clean everything but still running high nox and i failed at least 10 times
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I had this problem, High nox is due to your EGR not working properly (EGR helps keep the cylinders cool, hot cylinders = more nox). One of my hoses was collapsed, fixed that and it worked like a charm. But, there's more to your EGR than just the hose but start at the vacuum hoses for your EGR. If not, change/clean your EGR. S13s a little different but it should be in the same area, it's located on the passenger side at the back of your head. Looks something like this:
http://forums.nicoclub.com/240sx-egr...l-t427162.html
I updated the link on my post.