Yes disabled spark and injectors. Replaced wires with new iridium plugs also cleaned pcv system. Gauge older cal-van (40- 50 years) was fathers. have new one from harborfrieght but reads about 50 psi less, assumed it was cheap and wrong. Since doing all this smoke is so far about 95% less Not sure if this is just because all is new. will know in a day or so, drive about 120 miles a day to work.