Took the test today and passed. Not going to get in to what it took to "pass" at the end of 2004...
My NOX readings at 15mph were still a bit high, 508ppm (539 is max). But then at 25mph, was 364ppm (792 is max). Still wondering if Jeep is running slightly lean at low rpm since high NOX may indicate a lean runnign condition. (you Ca. guys know what you got on Nox for your 4banger?)
Carbon Monoxide was .08 (.72 max) at 15mph and .04 (.86 max) at 25mph. HC was 65ppm (max 93) at 15mph and 47ppm (58 max) at 25mph.
Think the reason I was square with CARB on this go around with SMOG was because I had fixed a busted exhaust manifold bolt that was allowing a slight exhaust leak. The leak probably screwed the Jeep's emissions equipment, maybe the cat and Oxygen sensor. I had been reading too high NOX before, though CO and HC were within range. I am slightly relieved about all this (need a whew! emoticon
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Note: I had to go to a Test-Only station. this go around, the test seemed a little more elaborate. The shop had this device that tests the seal on your gas cap - to see if any fumes will escape or something (I had to buy another gas cap) Guy then popped the hood, did the whole rundown as far as visual inspection. Now,this was a specialized place that just did SMOG tests, so the visual insepction was probably more strict than at places that offer more diversified automotive services - lube, repair, etc - in addition to SMOG test. But, buying that used air box, paper filter might not have been such a bad idea this go around. This guy didn't look like he'd haver passed a cone filter/metal tube setup without a CARB-exempt decal on it. California Jeep people beware.