What is the reason for the car idling vibration?

There are three main reasons for idling vibration of automobiles, and the solution is to find out the problem first.

The vehicle environment and the main driving state of the vehicle determine that the most likely cause of idle jitter of the van is not carbon deposition, but engine foot glue and ignition system.

Take Wuling Glory V as an example. This car has a front-mounted rear-drive micro-surface, and the layout of the engine is no different from that of a general rear-drive car. However, the positioning of the car is not high, and the maximum displacement of the engine is only1.5l. The characteristic of the car is that it will gain power with frequent large throttle and high speed.

The easiest stage of engine carbon deposition is ten minutes between cold start and high enough engine temperature. However, if the van is started at a high speed under full load or full load, the high-pressure exhaust formed by high-speed rotation at the initial stage of carbon deposition will effectively clean up the carbon deposition, so the carbon deposition in the van is generally not very serious, so we should check the problem from two other points.

The first point is the engine foot glue. The engine and the frame are not rigidly connected, but flexibly connected with the engine through rubber foot glue. The vibration generated when the engine is running will be filtered out by the thickness and elasticity of the rubber itself, and the vibration feeling fed back to the frame will be small or not felt at all.

However, the rubber pad of engine foot rubber will age, harden and become brittle under high temperature and natural weathering environment in the engine compartment. Once the rubber pad has no reasonable vibration filtering ability, or even is crushed, the vibration in engine operation will be directly transmitted to the frame and then to the interior of the car body, and the unbalanced vibration will be relieved to some extent when the engine runs at high speed, so it is not obvious. The accessories used in the van are not of high grade, the environment in the car is poor, and the probability of foot glue damage is high, so you should check your feet first.

The second point is the engine ignition system, including ignition coil and spark plug; Leakage of ignition coil will lead to engine jitter, power decrease and carbon deposition increase due to cylinder loss; The damage of spark plug or the decrease of discharge capacity will lead to the failure of effective ignition of oil-gas mixture due to high misfire rate, and will also cause engine jitter and power reduction.

The inspection of the ignition system is relatively simple. If you use a multimeter to test whether there is any leakage, it is good to test the flashover ability of the spark plug separately. The main reasons that can cause idling jitter are these two points, followed by frequent traffic jams and long-term hot car habits in cities, and engine carbon deposition will be more serious. Whether it is caused by carbon deposition can be judged by your own driving habits for reference.