I have 85 honda civic CVCC. I want ask about this technology CVCC I have two oily spark plugs#2 and #3 do you think it could be those CVCC valve. The car smoked I changed valve seals of the intake and exhaust valves but not of CVCC valves. No more smoke after that but now it stated to smoke again. How can I know if it s a smoke come from oil or gas? Thank you