Quote:
Originally Posted by milto0n
Replace cat as a later resort (and save it for next inspection!)
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You are spot on for what you said above this, but wrong when you say cat last. The fucking thing is 20yo and has 180k mi on it. Yes high NOX is no always a indicator of a bad cat but the damn thing is old and it needs to be replaced regardless.
One thing that affects NOX a lot is timing and yours is way wrong, last time I had a smog I had to have +-3*. Also vac leaks maybe causing your car to lean out could raise your temps causing nox.
Seafoam, change your oil, change your plugs, change your cat, fix what you failed on visual, then go again. Do not rely on denatured alcohol as I have given that a try twice with worse results then before, its not always a fix all.