After doing all types of repairs; overhauling (changed piston and ring) and replacement of defective 2nd oxygen sensor, heavy smoke stopped. My km/liter consumption has improved from 7.5 km/L to 9.25 km/L. The problem is when rev at 3,000 or more, visible black smoke is coming from the exhaust pipe. Have it scanned but no problem detected. What are the possible reasons? I don't know what to do with my car.
P.S. My car is about 378,000 KM
have the same problem?
Tuesday, November 11th, 2014 AT 11:13 AM