Is it normal to have a slight and rhythmic shake when the engine is idling?

When the engine was running, we could only feel a slight vibration in the cab, mainly due to the engine feet. The engine feet are generally made of rubber, and some high-grade feet are made of hydraulic structure. So, if the car has a long driving range, another common reason is that the injector is clogged, which is easy to clog after long-term use.

If it is not cleaned, it will affect the fuel injection atomization effect of the injector, thereby affecting the normal operation of the engine. Jitter caused by damaged engine feet is the most common malfunction. Engine feet are used to secure the engine and isolate engine vibrations.

When the engine was running, we could only feel a slight vibration in the cab, mainly due to the engine feet. When the engine is idling, the phenomenon of shaking indicates that a certain system or part of the engine is not working well, causing the engine to run abnormally. A common cause of jitter is severe ablation of the spark plug electrodes, which can lead to poor ignition of the engine.

In the case of starting the vehicle, pry the bottom of the engine with your hands or find a crowbar. If the shaking is reduced or there is no vibration at all, you can be sure that it is the foot of the engine!

If the jitter is still there, it's time to find the next problem! Check first to see if your idle speed is adjusted. If the idle speed is too low, the engine can easily stall, so the idle speed will shake frequently.

If the foot pads come off or are damaged, the engine will shake when it is unbalanced. The third is that there are debris in the engine oil, and the fuel injection will shake if it is not normal. Carburetor clogging also affects the amount of fuel injected and injected.

It's also simple to determine if there is a problem with your feet. When starting the vehicle, pry your feet with your hands or find a crowbar. If the shaking is reduced or there is no problem, then you can be sure that it is a problem with the feet!

If the jitter is still there, it's time to find the next problem! When the machine moves, there will definitely be regular shaking. Oil viscosity, various airflow sensors, oxygen sensors, engine mixture concentration, air-fuel ratio.

It is best to contact a professional 4S shop for computer testing, comprehensive consideration, maintenance and repair, the oil pressure is unstable, and it mostly appears on the sensor. There are many sensors in the car, such as fuel supply pressure and intake pressure sensors. If there is a problem, it will also cause the car to shake.

If it is severe, the part needs to be replaced.

This is not normal, because it can be seen that the engine is faulty, and this kind of thing is difficult to solve, so when we encounter this situation, we must send the car to a professional car shop for repair, and never bring unnecessary trouble to ourselves.

Abnormal, this situation usually proves that there is a problem with the engine or a part is not working well, so it will cause shaking, or it may be caused by the spark plug.

This kind of jitter is not normal, it may be because there is a problem with the engine, or there is a malfunction of the engine, so there is a slight jitter.

A burst of engine idle shake means that the vehicle has one of three conditions:

The first is the unstable oil pressure. If you have cleaned the engine carbon deposit, washed the throttle, changed the oil cushion and spark plug, etc., and still found that the body shakes when idling, it is recommended to go to the 4S shop to check the fuel supply pressure and intake pressure sensor, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, it will cause the body to shake. The best solution is to check the oil pressure and replace the parts if necessary.

The second is the aging of engine parts, such as the aging of engine feet, which may cause the body to shake. The engine foot is actually the shock absorption 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.

The third is that the engine throttle valve is too dirty or the fuel injector is too much carbon deposited and causes shaking. When there is too much carbon deposit, the gasoline sprayed by the cold start injector will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin and difficult to start. After the car hits the car, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, so that the mixture becomes thicker, and the combustible mixture of the engine is dilute and sometimes thick, causing idle shaking.

The solution is to clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned.

1. The engine has serious carbon deposits

Engine carbon depositsI believe that many old drivers know that if there is too much carbon in the engine, the vehicle will have poor engine working condition, high fuel consumption and even difficult starting, which will cause greater damage to the vehicle over time.

The carbon accumulation of the engine is caused by the bad habits of daily driving, such as idling for a long time, slamming on the accelerator and braking, poor oil quality, high-end and low-speed driving, and no regular maintenance.

2. There is a problem with the ignition system

When some components of the ignition coil of the arc system of the automobile or the circuit are broken or short-circuited, the primary current is too small, the secondary voltage is too low, and the ignition adjustment fails in advance, it will lead to the unstable state of engine operation, which will make its acceleration performance deteriorate, the power and fuel economy will deteriorate, and the problem of idle jitter will also occur.

3. The oil pressure is unstable

There are many factors that cause unstable engine oil pressure, such as lack of oil, dirty oil, thinning of oil, leakage of oil pipes, damage to the oil pump or excessive wear of its parts, etc. It is worth mentioning that if the engine continues to run under the condition that the oil pressure is too low, the situation may cause the engine to "burn the tile", and the engine will not start at this time, and the tile needs to be scraped or replaced.

Common engine failures.

Needless to say, the phenomenon of engine oil leakage is mainly caused by many reasons, and the harm caused by different degrees is also different. Engine oil leakage is mostly caused by the aging of the sealing gasket, and the common oil leakage parts include oil pan gasket aging and damage or loose screw oil leakage, oil drain screw loose oil leakage, leakage gasket, screw buckle damage, timing gear cover gasket aging and oil leakage.

The valve chamber cover gasket seal is not tight and leaks, the crankshaft front and rear oil seals are leaking, the oil radiator gasket is aging and the sealing is not tight, the filter base gasket is aging and the sealing is not tight, and the solution is also very simple, according to the degree of oil leakage, replace the gasket or components.

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.

Fuel consumption becomes higher, and carbon deposits in power will cause insufficient combustion of gasoline, causing engine shaking and unstable speed. Difficult to start, easy to stall, high engine temperature, etc. Now, with the development of science and technology, it is also possible to solve the engine shake and unstable speed by not hanging the bottle.

Difficult to start, easy to turn off the problem.

There are several reasons for engine shake:

1. The engine has serious carbon deposits, and the most common car with serious shake is that the fuel injector throttle valve is too dirty or too much carbon;

2. Ignition system problems, check the working conditions of spark plugs, high-voltage wires and ignition coils;

3. The oil pressure is unstable, if the first pressure of the pump is abnormal or the error and poor work of the inlet pressure sensor will cause the body to shake;

4. Aging of engine parts; Excessive carbon deposits in engine emissions absorb carbon from the gasoline of the cold-start injector, which leads to a dilute cold-start mixture and difficulty starting.

Specific solutions to idle jitter:

1. The engine has serious carbon depositsThe most common cause of idle judder is excessive carbon build-up on the throttle or injector. When there is too much carbon deposit inside the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by the carbon deposit, resulting in a mixture that is too thin and making it difficult to start.

After landing, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine and burned, which will thicken the mixture. The mixture is sometimes dilute and sometimes thick, which will cause idle jitter after cold start. The lower the temperature, the greater the amount of oil required for cold starts, and the more the presence of carbon deposits affects cold starts.

The solution is to clean the carbon deposits at the throttle and injector.

2. Poor ignition system and poor ignition of spark plugs will also lead to engine idling and shaking. If there is a problem, check if the ignition system is faulty and if there is too much carbon deposited in the spark plug.

3. The oil pressure is unstableIf you have cleaned the engine carbon deposits, cleaned the throttle valve or replaced the spark plug, and there is still the problem of body shaking when idling, it is recommended to 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 not normal or the intake pressure sensor is incorrect, it can also cause the body to shake when idling.

Solution; The best way is to clean the oil circuit, clean it regularly, there is no specific experience in the research and development parameters of the clean engine from the new car, coupled with the continuous improvement of emission standards, can not adapt to the change of fuel, all manufacturers of the engine are unable to solve this jitter problem in the short term, plus the fuel quality is not very good or the initial fuel of the new car factory 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. The occurrence of excessive carbon deposits is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits. The use of PNF dope fuel additives can solve the problems caused by carbon deposition.

What to do if the engine is shaking at idle.

1.Check the engine tachometer pointer when idling up and down, if it swings, the air intake system is faulty, such as: idle motor, throttle and so on.

2. Plug in the computer detector to detect whether the engine has fault codes.

3. Use a computer detector to detect: intake pressure sensor, throttle position, oxygen sensor voltage and ignition advance angle and other values.

4. If there is no problem with the above, check or cremate the plug and cylinder line, and replace it if it is damaged.

If there is no problem with the above, you can only check the cylinder pressure.

The idle speed is unstable and jitter, and the idle speed adjustment screw needs to be adjusted. Spark plug ablation, throttle deposits, combustion chamber deposits, clogged fuel injectors, or a cylinder block that does not work can also cause unstable idle jitter.

If the engine speed is not as uniform as when walking on the road, it is normal for the general shake to not be very strong.