In fact, we can roughly judge whether a vehicle is "healthy" from the exhaust color of the vehicle. Many car owners are likely to encounter a sudden large amount of white smoke from the exhaust pipe when using the vehicle. Is it normal for the exhaust pipe to emit white smoke? Here is a detailed analysis of several common situations.

其實(shí)不一定說排氣管冒白煙就是出現(xiàn)機(jī)械故障，我們需要分情況去考慮。

In fact, it does not necessarily mean that white smoke from the exhaust pipe is a mechanical failure. We need to consider it according to the situation.

1、冷啟動(dòng)時(shí)排氣管突然冒大量白煙。這種情況非常正常，因?yàn)槠嚴(yán)鋯?dòng)時(shí)汽油中的水分太多，所以啟動(dòng)后水分會(huì)被蒸發(fā)出來導(dǎo)致排氣管有大量白煙，我們只需要充分熱機(jī)之后這種情況就會(huì)消失；

1. During cold start, the exhaust pipe suddenly emits a lot of white smoke. This situation is very normal, because there is too much water in the gasoline during the cold start of the car, so the water will be evaporated after the start, resulting in a lot of white smoke in the exhaust pipe. We only need to heat the engine fully, and then this situation will disappear;

2、排氣管冒藍(lán)煙。這種情況就不太正常了，冒藍(lán)煙通常就證明發(fā)動(dòng)機(jī)存在燒機(jī)油現(xiàn)象，機(jī)油與汽油共同燃燒導(dǎo)致污染加重。燒機(jī)油的主要原因是因?yàn)榘l(fā)動(dòng)機(jī)活塞環(huán)老化氣密性降低，機(jī)油有機(jī)會(huì)進(jìn)入到燃燒室參與燃燒過程；

2. The exhaust pipe emits blue smoke. This situation is not normal. Blue smoke usually proves that the engine burns engine oil. The CO combustion of engine oil and gasoline aggravates the pollution. The main reason for burning engine oil is that the engine piston ring is aging and the air tightness is reduced, so the engine oil has the opportunity to enter the combustion chamber to participate in the combustion process;

3、排氣管冒黑煙。出現(xiàn)排氣管冒黑煙情況大多數(shù)是因?yàn)槿加蜔o法充分燃燒所導(dǎo)致，這時(shí)候可以選擇開到維修店去檢查一下。當(dāng)然汽油質(zhì)量太差也會(huì)造成這種現(xiàn)象的出現(xiàn)。

3. The exhaust pipe emits black smoke. Black smoke from the exhaust pipe is mostly caused by insufficient fuel combustion. At this time, you can choose to drive to the maintenance shop for inspection. Of course, the poor quality of gasoline will also cause this phenomenon.

在冬季時(shí)排氣管冒白煙是很正常的，這就像我們冬季呼氣時(shí)會(huì)產(chǎn)生白霧一樣，排氣管的溫度比較高，當(dāng)遇道較冷的空氣時(shí)就會(huì)出現(xiàn)凝結(jié)現(xiàn)象，因此我們在冬季時(shí)發(fā)現(xiàn)車輛比平時(shí)冒更多白煙的話不用太過擔(dān)心。總的來說，除了冬季冒白煙和冷啟動(dòng)冒白煙之外，其余情況都很有可能是發(fā)動(dòng)機(jī)出現(xiàn)故障，需要盡快進(jìn)行維修。

It is normal for the exhaust pipe to emit white smoke in winter, just like white fog when we exhale in winter. The temperature of the exhaust pipe is relatively high, and condensation will occur when we encounter colder air. Therefore, we don't need to worry too much if we find that the vehicle emits more white smoke than usual in winter. Generally speaking, except for white smoke in winter and cold start, it is likely that the engine fails and needs to be repaired as soon as possible.