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95 cherokee high NOX
The last time it was tested, 2 years ago, there was the same problem. A state recommended emissions repair shop put on a new convertor and it passed just fine. It has been driven about 25,000 since then. It seems that a convertor would last longer than that unless something else was wrong. I have heard that a new convertor will get you passed on high NOX, but I would like to fix the root cause. High combustion temp leads to high NOX. Improper timing and EGR problems can cause high combustion temps. The book says timing on the 95 is non-adjustable. I had the air box off last month when I put on a water pump and don't recall seeing anything that lookes like the EGR valve but I will take another look tomorrow. Any other thoughts?
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