Chemicalblue Posted March 16, 2005 Share Posted March 16, 2005 83 NA 280zx here are the readings High speed Standard Current Reading Result HC (PPM) 152 123 Pass Co(%) 0.97 1.47 Fail co2(%) 13.8 NOx(ppm) 1082 597 Pass dilution(%) >6 15.3 LOW Speed Standard Current Reading Result HC (PPM) 157 163 Fail Co(%) 0.88 1.19 Fail co2(%) 13.8 NOx(ppm) 1084 814 Pass dilution(%) >6 15.0 If anyone has any advise Please Help, I just changed the O2 sensor and there was no change. I have to get the car running for my wife because I just Totaled her 04 neon last Fri. suc Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted March 17, 2005 Share Posted March 17, 2005 i think it was Tim who said u put a gallon of alcohal in the gas tank, and it will pretty much always pass emissions.......i can't remember exactly wht the stuff is, mayb tim will say sumthin--- Quote Link to comment Share on other sites More sharing options...
Chemicalblue Posted March 17, 2005 Author Share Posted March 17, 2005 Yes I did the search and I see that as a last ditch effort. I would really like the prob. fixed but I have no clue what may be wrong. Quote Link to comment Share on other sites More sharing options...
TheNeedForZ Posted March 17, 2005 Share Posted March 17, 2005 I am no expert, but I think HC and CO means you are running too rich. That or condition for burning is not good enough. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted March 18, 2005 Share Posted March 18, 2005 there is an adjustment on the air flow meter to lean it out -you will have to do this while connected to the machine. Quote Link to comment Share on other sites More sharing options...
RedNeckZ Posted March 20, 2005 Share Posted March 20, 2005 Have you done the normal stuff most of us do before trying to test. One of the best is changing your oil a day or two before testing. Also running carb or injector cleaner thru the system before testing (sea foam is great). Doing a tune-up before testing will help. Hope this helps, take care, Rich. Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted March 22, 2005 Share Posted March 22, 2005 I had this same problem with a Honda Prelude in 2001 when they first started requireint the NOX testing and they lowered all the maximums, I got results that were actually better than I got in 99, but anyway, I replaced the O2 sensor, Cat, IACV, cleaned the injectors, full tuneup, egr valve, some vacuum things and $1500 later I had about a 10% improvement. Then I added low octain gas with alcohol, it didn't do anything, couldn't figure out why (probably too many computer controls counteracting the cheat). Had no power. Then I took it to a mechanic who had a smog tester and said, get it to work. $350 later he said, come and get it, he got it 25% improved which was just barely passing. He turned the exhaust cam back a few degrees to keep more exhaust in the cylinders. Lost like 10% of my power. Then I took it to get it smogged per his instructions: 1. On a rainy day 2. Drive it on surface streets and rev it up, but don't drive it hard. 3. Leave it running while waiting for the service. Passed just barely. Then it started sucking a quart every 300 miles so I donated it to charity and bought a Z that is exempt. Hope this helps. Quote Link to comment Share on other sites More sharing options...
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