Is It Normal to See Blue Smoke During Cold Start?
1 Answers
Seeing blue smoke during cold start is not normal. This situation may indicate engine oil burning, which could be caused by aging valve stem seals or excessive clearance in the valve guides. It is recommended to visit a repair shop for a comprehensive inspection, as burning engine oil can reduce the engine's lifespan. When starting the car, it is advisable to warm up the engine first. You can observe the tachometer; when the RPM drops below 1000, the coolant temperature has reached the suitable operating temperature for the vehicle, indicating that the engine is fully lubricated. Burning engine oil refers to the situation where engine oil enters the combustion chamber and participates in combustion along with the air-fuel mixture. The phenomenon of 'burning engine oil' can lead to rapid damage of the oxygen sensor, increased carbon deposits in the combustion chamber, unstable idle, poor acceleration, and excessive exhaust emissions, among other adverse consequences.