What are the causes of car start shaking, what are the causes of vehicle start shaking?

Analysis of the causes of car shake:

1. Cold start jitter.

First of all, starting from the cold start, the main reason for the cold start body shaking is that the fuel combustion is insufficient, resulting in insufficient power of the car. The ignition energy is low, and when starting, especially when the temperature of the fuel and lubricating oil is low, more oil is required to meet the power. Over time, the pole gap of the spark plug gradually increases, resulting in a decrease in ignition energy and poor fuel atomization, which leads to the shaking of the body.

In addition, the ignition energy can also be reduced due to the aging of the ignition coil, the aging of the high-voltage wire of the spark plug, or the leakage of electricity.

2. 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.

3. Tire problems.

For tires, the tire must be balanced once when the car is replaced with 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.

4. 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 the engine idling speed is too high, and the carbon deposits generated by the engine in this 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.

5. 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.

Hello! The reasons for the shaking of the vehicle start are: 1. The engine lacks cylinders

Engine cylinder shortage mainly refers to the engine has one or more cylinders do not work normally, so that the exhaust gas flow discharged by the car has obvious intermittent, and the exhaust pipe shakes violently, sometimes accompanied by abnormal noise; 2. Aging or loosening of the foot glue: its function is to reduce the vibration and buffer of the engine when working, and to fix the engine; 3. Carbon deposition problems: including cylinder carbon deposition, throttle carbon deposition, spark plug carbon deposition, air intake carbon deposition, etc., when the carbon deposition inside the engine is too much, the ignition energy, air intake efficiency, and mixture ratio of the car will be affected, resulting in the unstable power output of the car; 4. Fuel system failure:

Answer: Hello, there are several reasons for the shaking of the car's start. 1. The clutch shakes to make the engine idle and run at low speed, hang up the low-speed gear, slowly release the clutch pedal and increase the throttle to start, if the body shakes at this time, it means that the clutch is shaken. 2. The uneven distribution of positive pressure between the main and driven discs often engages the uneven elastic force of the compression spring of the engaged-type clutch, and the adjustment of the separation lever is inconsistent and the finger end of the diaphragm spring separation is uneven, which will lead to the unsynchronized compression time, the uneven force of the pressure plate, and even the skewed pressure plate, resulting in poor contact between the main and driven discs, resulting in the shaking of the clutch.

Beimai auto parts network experts said that at this time, the clutch compression spring should be replaced and the release lever should be leveled. 3. The elastic force of the damping spring becomes weaker, and the experts of Beimai Auto Parts Network said that the elastic force of the clutch torsional damping spring becomes weaker, the elastic force of the clutch compression spring becomes weaker, and the cracks in the diaphragm spring will cause the clutch to tremble when engaged. The strategy that should be adopted at this point is to replace the springs.

4. Poor contact of clutch lining, poor contact of clutch lining, surface hardening or glue-like substance, easy to cause clutch trembling. At this time, the clutch lining should be re-connected. 5. When the driven disc is warped, skewed and deformed, the clutch lining will be in irregular contact during the clutch engagement process, and the pressure cannot be increased smoothly.

At this point, the driven disc should be calibrated or replaced. 6. The clutch trembling is caused by loose or serious loss of parts, the clutch control mechanism is locked or loosely connected, the clutch plate spline load is seriously worn, and the first shaft of the transmission is bent. At this point, the corresponding part should be replaced.

7. When the engine is loose, the engine is loose, or the first shaft of the transmission is different from the center line of the engine crankshaft, it is easy to make the clutch tremble. Beimai auto parts network experts said that the engine should be tightened or replaced at this time. 8. The driven disc loaded hoe is broken or loosened, the driven disc loaded hoe is broken or loose, the driven disc steel sheet is broken, and the dynamic balance of the rotating parts does not meet the requirements, which causes the clutch to tremble.

At this time, the parts should be replaced or re-connected with the driven disk. I recommend that you test it, I hope it can help you.

Question: I'm boasting together GAC Trumpchi dual-clutch automatic transmission car 200,000 kilometers of test kilometers Now there is shaking at the start You are always normal There is shaking from time to time.

Hello, idling body shake is a common situation encountered by many car owners. If the owner finds that the body shakes significantly while starting the vehicle or stopping the vehicle without turning off the engine, it may mean that the vehicle has one of the following three conditions:

1.The most common cause of car shake caused by serious carbon deposits in the engine is that the throttle valve is too dirty or the fuel injector is too much carbon. When there is too much carbon inside the engine, the gasoline ejected from the cold-start injector will be absorbed by the carbon deposit, resulting in a cold-start mixture that is too thin and makes it difficult to start.

In this case, only when the gasoline absorbed by carbon deposits is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the vacuum suction of the engine after the car is burned, and the mixture becomes thicker, 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.

Solution: Clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned.

2.Ignition system problems Check the working condition of the spark plug, high-voltage wire and ignition coil, the ignition system is not working well, and the spark plug flashing condition is not good will also lead to this kind of failure.

Solution: Check whether the spark plug has too much carbon deposit, and replace the spark plug.

3.If the oil pressure is unstable, if you have cleaned the engine carbon deposit, washed the throttle, changed the oil pad and spark plug, etc., and still found that the body shakes when idling, it is recommended that you go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, the body shakes will be caused.

Solution: Check the oil pressure and replace the parts if necessary.

4. Aging of engine parts.

Car jitter is also related to the aging of the engine feet (also known as claw pads). The engine foot is actually the suspension system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing shaking when idling.

Hope it can be adopted, thank you.

You don't need to step on the accelerator when you are cold, and you can start by idling. Because of the high rotational speed. After the car is hot, the idle speed is low and the power is small, so it will shake when starting simply by idling.

1. The main reason for the difficulty in starting is that the engine temperature is too low, so we can avoid not being able to hit the car as long as we keep the engine warm and do not let the biting cold wind blow directly into the engine compartment. Therefore, when parking in winter, pay attention to the direction of the front of the car, it is best to keep the front of the car facing the building, and use the building to block the wind and prevent the engine from being blown by the cold wind and getting too cold.

2. When parking at night, you can turn the front of the car to the direction of the sun, so that the first rays of sunlight in the morning can shine on the front of the car and help the engine heat up, so that it is much easier to get out of the car. Usually, you should also go to the designated service station regularly to check and adjust.

3. The engine is turned off when changing gears.

3. When changing gears, the engine stalls, which may be due to the idle speed being too low at that time, or the idle stop valve is not tightened, or it may be that the gear is too high and suffocated, and there is also a possibility that the oil-gas separator is seriously blocked. At ordinary times, the first gear should be basically applied at the start, and the idle stop valve should be checked to see if it is tightened and whether the plug is tightened. At the same time, it is best to go to the designated service station to clean the oil and gas separator.

Causes of body shake when the car accelerates:

1. When driving, the car engine shakes normally, and sometimes there is a problem that it cannot be started once. It is that the throttle valve is too dirty, and the fuel injector and intake tract have too much carbon deposit. In the case of a cold car, carbon deposits will absorb a part of the fuel, and if the fuel does not completely enter the cylinder for combustion, it will produce symptoms of unstable idle speed and difficulty in starting.

2. When driving at a certain speed at high speed, the steering wheel can feel obvious shaking or jumping, but it is not obvious at low speed. In fact, there are many problems that cause automobile engine shaking, and it is necessary to first eliminate abnormal shaking caused by engine failure, because engine failure generally occurs at low speed.

How to shake the body when the car accelerates:

1. If the acceleration shake of the car is obvious, you can first visually check whether the balance lead block on the rim is missing, or whether the hub is obviously deformed. If all of the above is a problem, then professional inspection equipment is required, because the steering rods, suspension and subtle deformations of the wheel hub are difficult to discern with the eye.

First, check whether the left and right half shafts are bent, and then disassemble and check whether the inner walls of the left and right inner cages are worn and pitted.

2. Modern cars are mostly front-engined and front-driven, and the inner cage is mostly retractable to adapt to the change of the relative position of the gearbox drive terminal and the drive wheel when the vehicle is driving. After dismantling and inspection, it can be found that the part of the inner wall of the inner cage that is in constant contact with the outer skin of the needle roller bearing, that is, the part where the torque is transmitted (the stress point), has produced pits.

3. When the vehicle accelerates rapidly, the engine gearbox assembly should do a slight side flip action, thereby changing the position of the above-mentioned stress point, because there is a certain angle between the axial direction of the half-shaft and the axial direction of the inner ball cage, so this stress point continuously reciprocates along the axial direction in the rotation process of the ball cage, and the force generated by this change continuously pushes the body to the left and right sides, that is, the feeling of the above-mentioned "sieve chaff" occurs. Replace the damaged inner cage or half shaft.

Recently, some car buyers have told us why their cars have a slight shake when they start, and this kind of situation sometimes happens, so what is the cause of the car start-up shake? Are there any solutions?

Many of the problems that develop jitter appear in cars equipped with manual transmissions, and the most common manifestation of this is that the car shakes during the whole process of gradually developing from stationary to gradually extending the clutch pedal. This is also because of the clutch three-piece set (pump flywheel, clutch plate, pin) irregularly damaged, so that one or several of them cause deflection, in the whole process of engagement, the clutch plate can not be stably engaged, just a little engagement, shed tung a little and loose, so that the car engine driving force just began to transmit, and suddenly deviated, the embodiment of the car is similar to the feeling of jumping.

The solution is to replace the destroyer in the clutch trio.

So some people will ask, how to tell if the car start-up jitter is related to the clutch? We can let the engine idle and put on low gear, gradually loosen the clutch pedal and increase the development of the accelerator pedal, if the car body shakes at this time, then it means that Changyou is clutch shake.

In addition to the irregular damage of the clutch three-piece set (water pump flywheel, clutch plate, pin) just mentioned, it may also be the uneven distribution of positive pressure between the main and driven discs, the weakening of the elastic force of the shock absorbing spring, the poor contact of the clutch pad, the expansion and contraction, tilting and deformation of the driven disc, and the loosening or serious wear and tear of its parts.

Therefore, vehicle shaking is not a trivial matter, in every working condition caused by shaking reflects the problem of a certain component of the car, the car buyer should immediately go to a professional repair shop or a car chain Xuntan car 4S shop to carry out maintenance.