rustrocket Posted January 10, 2005 Share Posted January 10, 2005 I recently sold my Z, and bought a 84 volvo to replace it as a daily driver. However, the transaction went sour, and i now have a volvo that needs to pass smog at a *TEST ONLY* center, but it reads too high on the NOX section: Max Ave Meas 15 mph 1136 399 1661 25 mph 966 332 1047 I'd like to go the easiest route to have my car pass, and am open to ANY and all suggestions. Thanks. Quote Link to comment Share on other sites More sharing options...
Tim240z Posted January 10, 2005 Share Posted January 10, 2005 10% denatured alcohol in the tank. Give it a good hard run to 'clean it out'. I had the same problem with my Z28 (1994). It sat for a long while before I bought it and I failed on NOx also....very high. Took it for a long hard run (full rpm shifts to 3rd gear...at which point I was well over the speed limit). Then I ran the tank down to about 1/4 and dropped in some alcohol. Went straight to the test station, passed at 30ppm NOx, then went and filled the tank with gasoline to fully dilute the alcohol. Worth a try..... Tim Quote Link to comment Share on other sites More sharing options...
MrWOT Posted January 10, 2005 Share Posted January 10, 2005 Well, since you get NOx for having a really high combustion temp the easiest way to fix it is to add octane, slowing the burn. It will bring your HC emmissions up a bit, but it works, I did exactly this in my 91 SHO, I put in 5 gallons of pump 100 from a 76 station and passed with flying colors. Quote Link to comment Share on other sites More sharing options...
rustrocket Posted January 10, 2005 Author Share Posted January 10, 2005 Who sells 100 octane in the bay area? Quote Link to comment Share on other sites More sharing options...
auxilary Posted January 10, 2005 Share Posted January 10, 2005 there's a unical 76 gas station on almaden and wolfe that sells 100 octane at the pump Quote Link to comment Share on other sites More sharing options...
MrWOT Posted January 11, 2005 Share Posted January 11, 2005 I go the one on hwy 4 right after antioch, this is heading east. It's right about at the intersection of hwy 4 and 5. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted January 11, 2005 Share Posted January 11, 2005 Alcohol is octane. Sounds like both suggestions might work. Alcohol is also a pretty good solvent. It will help clean up the engine (and may clog your fuel filter with all the junk it breaks loose in the tank) Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted January 12, 2005 Share Posted January 12, 2005 make sure ign timing is at low end of spec.if engine has egr valve make sure its working.decarbonize the pistons with a chemical cleaner.try the 100 gas. Quote Link to comment Share on other sites More sharing options...
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