What Causes Smoke Emission from a Car

[ElainaFitz]

The main symptom of engine oil burning is blue smoke coming from the exhaust pipe. Other possible causes include: 1. Valve Seal Issues Valve seals prevent engine oil from entering the intake and exhaust pipes, which would lead to oil loss. They also prevent the leakage of the air-fuel mixture and exhaust gases, as well as engine oil entering the combustion chamber. If a large amount of blue smoke appears upon starting the vehicle after it has been parked for a long time, it is usually due to aging valve seals. There are various reasons for this aging, and it is recommended to visit a professional repair shop for replacement. 2. PCV Valve Malfunction The PCV valve relieves pressure from the engine oil pan. The oil and gasoline vapor components that are expelled along with the pressure are separated by the PCV valve, with the oil returning to the oil pan and other gases being redirected back into the combustion chamber for burning. If the PCV valve is damaged and cannot open, it will cause excessive pressure in the oil pan, resulting in engine weakness and oil leaks from various seals. If the PCV valve is damaged and cannot close, the evaporated oil will not be separated and will directly enter the combustion chamber to burn, producing blue smoke.