There is a slight intermittent jitter when the car is idling. Is it because the throttle is dirty?

With the increase of the number of private cars, our cars will inevitably have some minor problems. As an old driver with more than ten years' driving experience, today we will discuss common vehicle phenomena. The intermittent jitter of the car when idling is very small, but we can't take it lightly, so as not to cause major safety hazards. In fact, this problem is very easy to solve. Let me summarize it in detail. During the forced ventilation of the engine crankshaft, some oil vapor will be discharged through the PCV valve. Although the oil-gas separator can separate oil and gas, it is impossible to separate all the oil.

These oil vapors will be sucked into the intake manifold again together with the exhaust gas. When the throttle valve is at low temperature, it is easy to absorb these vapors and deposit them on the back, which affects the smooth intake. After the throttle is too dirty, although the engine ECU can match to a certain extent, if it exceeds a certain adjustment range, the idle speed will be unstable and jitter. There is a slight intermittent jitter when the car is idling, which may be the problem of the throttle, but it cannot be generalized because there are many reasons for the idling jitter of the car, and the throttle is only one of them.

At this time, experienced maintenance masters are needed to check them one by one. The vibration of the engine is usually buffered by rubber feet. When the engine is used for a long time, the rubber of the engine foot will age, harden or even break, resulting in engine jitter at idle speed. Although it will shake when driving, due to the vibration of the car body, especially the hydraulic foot used by many German cars, it is relatively insensitive and has better shock absorption effect, but its service life is relatively short. First of all, talk about the throttle.

When the throttle valve is too dirty, the intake smoothness of the engine will be affected. Even with ECU matching, when the engine is dirty to a certain extent, there will be unstable idle speed and jitter. At this point, you need to clean the throttle. After the spark plug is discharged for a long time, the gap gradually becomes larger. At this time, the discharge accuracy will be reduced, and even poor ignition will occur. In addition, due to the carbon deposition in the cylinder, part of the carbon deposition will condense on the spark plug, which will lead to the decline of emission quality and the deviation of ignition time between cylinders, thus leading to unstable idle speed. Another common problem is that the fuel injector has too much carbon deposit. Carbon deposition on fuel injectors is very common in most vehicles. Nozzle blockage will lead to poor atomization and reduce the combustion efficiency of the engine. Finally, there may be idle jitter. At this point, it is necessary to clean the nozzle and even the oil circuit.