| I would not use denatured alcohol. Either buy Seafoam or GM top engine cleaner. If it's know to be real bad, disconnect the cat before you start cleaning, As for lower nox, a few things will work. Higher octane, retard the timing or try an additive. Adding a few bottles of Heet drygas to a 1/2 tank will lower the nox a little. But remember as you lower the nox co2 and hc's usually start to rise. If you have a bad egr or you have the ports welded closed/removed it will be hard to do with above suggestions.
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ED BAKER
87-T, Maplight equipped rear view mirror..
93 PARK AVE"SUPERCHARGED" BPG#1458 My Photo Page   buickperformancegroup.com "As democracy is perfected, the office of President represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."---H.L. Mencken 1927 |