When the car is driving in winter, why does white smoke come out of the exhaust place?

If it is winter, it may be because the temperature is low, and the exhaust gas from the engine will condense at low temperature to produce water vapor, resulting in a lot of foggy white smoke. This situation is normal, just warm the car. If the temperature is normal, it may be that the engine piston is broken, or the cylinder liner is damaged and the engine burns oil.

Water in the coolant may also enter the cylinder. Check whether the amount of coolant is normal and whether the coolant gasket is damaged. In addition, it has something to do with the gasoline added. Did you add inferior gasoline? There is too much water in the gasoline? According to the displacement and idle speed of your car, the idle speed is high, you burn more gasoline, more water vapor, more exhaust, a large three-way catalytic network and more water vapor.

1, if it is black smoke, it means that the mixture is too thick, which is a sign of insufficient combustion.

Several methods to solve the problem: cleaning throttle, injector and air inlet; Matching the data of the driving computer; The gasoline is not very pure. Try adding a higher grade of gasoline.

2. If it is white smoke, it means that there is a small amount of water in the cylinder, which turns into white gas after burning and is discharged.

Cause of the problem and solution: It may be that the cylinder gasket between the engine cylinder head and cylinder block is punctured (easily punctured at high temperature), so the cylinder gasket can be replaced.

3, if it is blue smoke: this is the performance of burning engine oil.

The causes and solutions of the problems: It usually happens when the car is old or the mileage exceeds100000. Parts related to burning engine oil generally include: valve oil seal, valve guide, cylinder liner, piston ring, piston and so on. You can go to the repair shop to remove the engine, check the damaged parts and replace them.

If you find light smoke around the hood when driving, it may be that the engine water temperature is too high. I would like to remind you that you need to pay more attention to the water temperature when driving in summer. If the water temperature is too high when driving, it will accelerate the wear and shorten the normal service life of the engine.