I had my '88 4Runner (V6 Engine) tested at a California "test only" station. The carbon dioxide and nitrous oxide levels were normal, but it barely passed the hydrocarbon limit at 15mph, but easily passed hydrocarbon at 25mph.
Any ideas of what could have caused such a result? Are there any tricks or repairs that I can use next time to reduce the hydrocarbon at the slower speeds? CO2 % O2 % HC(PPM) HC HC Test RPM MEAS MEAS MAX AVE MEAS RESULT
15 mph 2824 14.33 0.29 121 35 118 Pass 25 mph 2466 14.52 0.04 101 24 27 PassThanks, Paul