有的车主有疑问，按理说汽车保养后，车辆工况应该更好了，油耗应该会降低啊，为什么很多时候油耗不降反增呢？而且是同一个人驾驶，路况也没啥变化。下面分几种情况简单回答一下这个问题。

Some car owners have doubts. In theory, after car maintenance, the vehicle's working conditions should improve and fuel consumption should decrease. Why does fuel consumption often increase instead of decreasing? And it's the same person driving, and the road conditions haven't changed much. Below, I will briefly answer this question in several situations.

1、油耗微增，一般百增加0.5L左右，不超过1L，原因有：

1. Fuel consumption has slightly increased, generally increasing by about 0.5L per 100 kilometers, not exceeding 1L, due to the following reasons:

2、机油粘度变大：在排除用机油的情况下，就算一模一样的机油，新换上的肯定比跑了1万的机油粘度要高，这样形成的阻力自然更大一些，相同路况相同驾驶的情况下，油耗自然会更多一些。这种情况一般跑个大几百就会慢慢消失。

2. The viscosity of the engine oil becomes larger: if the engine oil is not used, even if the engine oil is the same, the viscosity of the new engine oil must be higher than that of the engine oil that has run 10000 kilometers. This will naturally cause greater resistance. Under the same road conditions and driving conditions, the fuel consumption will naturally be higher. This situation usually disappears gradually after running a few hundred kilometers.

3、更换了刹车片：更换新刹车片之后，摩擦间隙相对较小，相对来说刹车时形成的阻力相对较大，从而会造成油耗微增，过了刹车片的磨合期就好了，一般300左右。

3. Replacing brake pads: After replacing the new brake pads, the friction clearance is relatively small, and the resistance formed during braking is relatively large, which can cause a slight increase in fuel consumption. After the brake pad's break in period, it will be better, usually around 300 kilometers.

4、稍微加多了机油：机油过多，机油中的曲轴转起来就需要更多的能量，这不就增加了发动机的负荷了吗，油耗自然会有所增加。

4. Slightly adding more oil: If there is too much oil, the crankshaft in the oil needs more energy to rotate, which increases the engine's load and naturally leads to an increase in fuel consumption.

5、油耗增加挺多，原因有：

5. The fuel consumption has increased significantly due to the following reasons:

6、如果更换了火花塞/喷油嘴，可能安装有问题或使用了错误型号：比如安装没按标准扭矩来上紧，容易产生漏气，致使缸压变小，发动机无力，从而增加油耗。

6. If the spark plug/fuel injector is replaced, there may be installation problems or the wrong model may be used: for example, if the installation is not tightened according to the standard torque, it is easy to cause air leakage, resulting in a decrease in cylinder pressure, engine weakness, and increased fuel consumption.

7、如果有清理积碳：

7. If there is a cleaning of carbon deposits:

有些情况跑着跑着就会正常，因为行车电脑需要一定的里程来适应清理后的工况。不过，如果清理积碳后，由于清理下来的积碳导致三元堵塞，也会导致油耗上升。

In some cases, running will be normal because the driving computer needs a certain mileage to adapt to the cleaned working conditions. However, if the carbon deposits are cleaned up and cause ternary blockage, it can also lead to an increase in fuel consumption.

8、清洗了节气门：

8. Cleaned the throttle valve:

这种情况一般是清洗后忘记了匹配，去匹配后油耗就会正常。

This situation is usually caused by forgetting to match after cleaning, and after matching, the fuel consumption will be normal.

9、平均油耗被清零：保养时候平均油耗被重置，这样重新计算油耗，如果你不是马上走的是高速，重新计算的油耗前期都会很虚高，跑个几百就会下来了。

9. Average fuel consumption is reset to zero: During maintenance, the average fuel consumption is reset, so the fuel consumption is recalculated. If you are not driving on the highway immediately, the recalculated fuel consumption will be very high in the early stage, and it will come down after running a few hundred kilometers.

保养后油耗增加的原因差不多就这些了，遇见了大家可以比照来看，应该能比较快速的找到问题所在。

The reasons for the increase in fuel consumption after maintenance are basically these. If you encounter them, you can compare them and quickly find the problem.

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