When the engine speed is unstable, can it be repaired by itself?

When the engine speed is unstable, can it be repaired by itself? When the engine speed is unstable, it can be repaired by itself. The exhaust gas recirculation valve, also called EGR valve, is installed at one end of the exhaust manifold. It connects the exhaust manifold and the intake manifold. When you step on the accelerator, the computer controls the EGR valve to open, allowing some exhaust gas to re-enter the cylinder to participate in combustion. The EGR valve is not always open, and it will only open when the throttle opening and engine speed reach a certain level. Due to the high temperature of exhaust gas in the valve body, after long-term use, the valve body may produce some carbon deposits, which will lead to the lag of EGR valve, especially when driving at high speed or high speed, the valve body is always open.

It may not reset after parking, but it is always on. In this way, when idling, exhaust gas will enter the cylinder, while when idling, the intake air is less, and some non-combustible exhaust gas will be mixed, which will naturally affect the combustion and cause the engine idling to be abnormal. Sometimes it is found that the brake disc is worn out of the groove. This is because there are hard particles in the brake pads, so that the brake pads cannot be worn off. Therefore, the brake disc is ground very hard. If the groove is large, it will affect the service life of the brake disc. In this case, if you go to the 4S shop for maintenance, you will replace the brake pads.

If you don't understand, you will even replace the brake disc and brake pad. EGR valve is called "exhaust gas recirculation control valve" in Chinese. Nowadays, for the sake of environmental protection and energy saving, all automobile engines have added an exhaust gas recirculation system, that is, the exhaust gas discharged from the engine is re-inhaled into the engine for secondary combustion. This has two advantages: fuel that is not completely burned in the exhaust gas can be used; The car is still good, not fuel-efficient, not fuel-efficient, high-speed 5-6 liters, urban 8-9 liters, depending on the traffic jam! Maybe there is no harm without comparison. In addition to the driving school car, the only one that has ever driven is Santana. The content of harmful substances in engine emissions can be reduced by secondary combustion.