The car has not been under high maintenance for a long time, what happens when it shakes when it sta

Poor coordination between the clutch and the throttle will also cause the car to shake, and the three-cylinder engine will shake even more.

The most common cause of car shake is a dirty throttle or excessive carbon build-up in the fuel injector.

When the carbon deposition inside the engine is excessive, the gasoline sprayed by the cold start fuel injector will be absorbed by the carbon deposition in large quantities, 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 on the car, and the gasoline adsorbed on the carbon deposition after the car 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, causing 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. It is inevitable that the carbon deposit will be generated during the engine work, but when the carbon deposit is too much in the engine, it will cause the engine to work poorly and produce different failures.

When there is too much carbon deposit inside the engine, the gasoline sprayed out by the cold start fuel injector will be absorbed by the carbon deposit, resulting in the mixture of cold car start is too thin, making it difficult to start, until the gasoline absorbed by the carbon deposit is saturated, it is easy to get started, and the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine after landing, so that the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, causing idle shaking after the cold car starts.

Solution: Clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned. Or for a period of time, drive at high speed in low gear and increase the engine speed, the purpose of which is to increase the air intake of the engine and the flow of gasoline, which helps to remove carbon deposits from the nozzle.

A slight jitter is normal, but if the jitter is more intense, it is a problem. This failure is due to irregular wear of the clutch trio (flywheel, clutch plates, pressure plate), which causes one or more of them to slew. In the process of engagement, the clutch plate can not be smoothly engaged, but engaged a little bit, and then released, so that the engine power just began to be transmitted, and then suddenly skidding, and the performance of the vehicle is similar to the feeling of jumping and jumping.

It is also possible that the starting shake is caused by excessive carbon accumulation in the throttle valve, idle motor, intake duct, intake valve, combustion chamber and fuel injector. Because of the poor atomization of the mixture in winter, coupled with excessive carbon deposits, the engine load increases during starting, which will lead to the phenomenon of start-up shaking. Excessive carbon deposition can also lead to weak acceleration.

It is recommended that you go to the 4S store for on-site inspection according to the above analysis.

After the car is maintained, the engine shakes, you can see if the vacuum tube is touched, the air leaks, the plug is loose, etc., it is recommended to let the professional maintenance personnel re-check.

In general, there are the following reasons for engine shake:

1. Lack of cylinder: check the cylinder line, call to see which cylinder line has no fire, if there is a cylinder that does not work well, the engine will shake due to the lack of cylinder.

2. Carbon deposition: If the car is often idling, the engine will be prone to carbon deposition, and then it will be easy to have poor air intake, resulting in engine shaking.

3. Idling: If the car idles, and if the number of revolutions is low to a certain extent during driving, it will exceed the value set by the computer, which will cause the engine to shake.

4. Engine stabilizer foot: The engine stabilizer foot is the shock absorption system of the engine, and the engine stabilizer foot is responsible for absorbing the subtle shaking of the engine when it is running.

5. Brake disc: If you are accustomed to sudden braking and sudden stopping, it will cause uneven brake disc, which will make the brake disc uneven, and will also cause the engine to shake when braking.

According to the condition and maintenance of the car, see if all the items are finished, or in Qi Peikai maintenance encountered other spare parts, resulting in loose spare parts, another situation is the engine idle setting, that is, the memory value of the idle value is not stored, in this case, it is recommended to go to the repair shop for idle speed setting can be solved, which is a common fault after the engine is maintained, and it is also caused by the reversal of the maintenance steps. As for the fuel consumption value, the current road condition simulation and fuel consumption value will be restored after one week according to the engine control unit memory function. For the liquid level height of the oil in the engine lubrication, it is recommended to go to the repair shop for excess discharge, and the amount of lubricating oil is liters under normal circumstances, otherwise it will cause the engine to burn oil slightly and the temperature is easily high.

Photo by Lai Choi Ying) @2019

It may be that the idle speed is unstable, the cylinder is missing, or the oxygen sensor is dripping oil during maintenance, and it needs to be checked again in the garage.

Engine cylinder lack mainly refers to the engine one or more cylinders are not working properly, generally manifested as: the exhaust gas flowing out of the car has obvious intermittentness, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noise. This is mostly related to ignition coil failure.

When the car starts cold, the engine lubrication effect is poor, and the oil has poor fluidity and viscosity, so there will be abnormal noises such as mechanical wear, cold start, low coolant temperature, excessive mixture, and insufficient combustion, which will cause the engine to shake and merge, which is generally a normal phenomenon, and will get better after the car is warmed.

If you accidentally touch something during maintenance, it will also cause the engine to shake and the rev will drop. For example, if the vacuum tube on the intake branch falls, it will cause the vacuum tremor pressure on the intake branch pipe to deviate, resulting in jitter. In addition, the plug of individual sensors falls off, which will also cause idle jitter or even fail to start.

When the engine's electrical system is switched on at idle, it increases the load on the engine and causes idle slippage. At the same time, in order to compensate for the jitter caused by idle slippage, the engine automatically pulls up the revs. Abnormal oil pump supply pressure, incorrect intake pressure sensor, and poor operation can cause engine shake.

Summary. Thank you for your question.

Sometimes the tire pressure is insufficient, or there is a problem with the balance, which can easily cause the vehicle to tremble, so it is necessary to carefully check the tire pressure to see if the tire is wearing abnormally.

What is the obvious reason for the shaking in the car after car maintenance?

Thank you for your questionSometimes the tire pressure is not insufficient, or there is a problem with the balance, it is easy to cause the vehicle to tremble, so you should carefully check the tire pressure to see if the tire has abnormal silver bend wear.

When idling, you can feel a slight shake when you put your foot on the accelerator and brake, what is going on?

4 new tires for the gold bar just crown.

It may be a dirty throttle problem, today I changed 4 tires, and the problem occurred after the oil filter.

There are many kinds of this problem, dear, it is recommended that you go to repair it and check it.