What is the problem with the shaking of the car when it starts

The main causes of unstable idling and jitter:

1. The most common cause of vehicle shaking is that the throttle is too dirty or the fuel injector has too much carbon.

2. When the carbon deposition inside the engine is too much, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get started, 3. After the car is adsorbed, the gasoline adsorbed on the carbon deposition will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking after cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start.

Severe idle vibration is generally caused by engine cylinder failure, aging or loose foot rubber, carbon deposits, fuel system failure, etc.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the above problems caused by carbon deposits. The fuel quality is not very good or the initial fuel of the new car is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage, and the carbon deposition exceeds the standard, which is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

As long as the water temperature is normal, it's fine. No problem, it was cool in the morning or for a long time to park the car, and the engine water temperature did not reach the normal temperature. The mixture supplied by the engine computer is thick, and the oil supply is small, which cannot meet the lubrication requirements, so the speed is high and the sound is loud or the work is unstable and the exhaust smell is large, and as the engine gradually heats up, it slowly returns to the normal idle speed.

There are many bad reasons for the car to tremble when it starts, and it is necessary to check and repair it in time.

The engine starts to shake, which may be caused by oil blockage, which is caused by oil blockage caused by the vehicle not being maintained for a long time. Engine start-up shake can also be caused by excessive carbon deposits in the engine, which are related to the owner's driving habits, driving conditions and fuel quality.

If the air filter of the car is dirty, it can not better filter the impurities in the air, increase the wear and tear of the engine, and cause the engine to shake when the car starts, and the air filter is generally replaced once every 10,000 kilometers. If the spark plug is used for too long or if the spark plug has quality problems, it is easy to cause the engine to shake when it starts.

Inspect the vehicle

During the slow lifting of the clutch pedal from a standstill, the vehicle shudders. This is due to the irregular wear of the clutch three-piece set (flywheel, clutch plate, pressure plate), so that one or several of them have a deflection caused, in the process of engagement, the clutch plate can not be smoothly engaged, but a point of engagement, a point and release, so that the engine power has just begun to be transmitted, acres and suddenly slip, the performance of the vehicle is similar to the feeling of jumping.

Car shake and Hu Naisi is not a trivial matter, in each working condition of the shake reflects a part of the vehicle pants problem, the owner in the car shake, should go to a professional repair shop or 4S shop for maintenance.

Analysis of the original circle of automobile jitter:

1. Suspension system problems.

Body shake is also related to the aging of the suspension system. It is mainly responsible for filtering out the shake of the engine when it is running, and if there is a problem with the suspension, these vibrations will be transmitted directly to the steering wheel and cab, affecting the driving. When the engine is idling, it is easy to cause shaking when the electrical system in the car is turned on.

The engine will increase the load when the electrical appliances are turned on, causing the idle speed to drop, and to compensate for the jitter caused by the idle slip, the engine will automatically increase the speed by partially. So, when the electrical system, especially the air conditioner, is turned on, the engine will often shake. This jitter is likely to be caused by the aging of the shock absorber and needs to be replaced in time.

2. Tire problems.

For tires, the car must be balanced once when replacing new tires and new steel rims, otherwise the steering wheel will be prone to shake when the counterweight is uneven. If you find that the tire weight is not equal, you need to add lead to the inside of the rim to average the weight of the tires on both sides. Whether it is a general steel ring or a lightweight aluminum ring, it may deform or crack when subjected to a certain external force.

Deformation of the rim can cause shaking when driving, uneven weight of the rim can also cause shaking when driving, and incorrect angle of the rim can also cause shaking when driving.

3. Throttle problems.

The most common cause of car shake may be a dirty throttle valve and excessive carbon build-up in the fuel injector. After the car travels for a period of kilometers, the throttle valve will be too dirty to cause the throttle to close loosely or the idle motor to stagnate, resulting in too high idle speed, and the carbon deposit generated by the engine in the process will also cause the vehicle to shake, especially when starting the vehicle, the engine will shake more than normal, and even sometimes there will be a phenomenon that can not be started at one time. Therefore, when the body shakes, the first thing to do is to check the throttle and fuel injectors.

If you find that the throttle valve is too dirty or the fuel injector has too much carbon deposit, you should clean it with fuel injector cleaner or throttle cleaner in time.

4. The oil pressure is unstable.

If you still find that the body shakes after these are finished, it is recommended that you go to the repair shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is not normal, the intake pressure sensor is wrong and improper work will cause the body to shake.