I feel that the engine is unstable and vibrating when my car is idling with T, but the speedometer i

1.The spark plug loses its ability to ignite.

2.The throttle valve is faulty. Both of these problems can cause engine shake and unstable speed.

3.Carbon deposits can cause insufficient combustion of gasoline and cause the engine to shake. The impact of engine carbon deposition on the car is quite large, first of all, to reduce the engine power, that is, to make the power output uneven and gradually decay, in other words, more and more powerless.

The second is to increase fuel consumption and increase your financial burden. The third is the difficulty of cold start, that is, the difficulty of ignition, it is not easy to get on the car, and finally the carbon deposit in the combustion chamber is strict, and a heavy one will also cause cylinder detonation, and there will be a sound of low-speed acceleration, which will cause damage to the piston and crankshaft, and cause high temperature of the engine, which will seriously affect the safety of the car. Then there is the excessive discharge, which not only fails the annual inspection and inspection, but also directly aggravates the harm of polluting the environment.

4.The load operation of the transmission will destroy the quality and friction characteristics of the transmission oil, increase the friction and wear, and the transmission noise will follow, and at the same time, the sludge (impurities or dirt) will also be generated inside the transmission (such as the valve body), resulting in the transmission stuttering, disgearing, impact, skidding, stalling, abnormal noise, delay, high temperature, oil leakage, etc. (Audi and other high-end models will call the police and enter the transmission protection mode) If it is not solved in time, the transmission will be scrapped.

When my car idles with T, I feel that the engine is unstable and vibrating, but the speedometer is very stable, which means that the combustion is not good. It is necessary to start with combustion and three-way catalytic emissions, and if the three-way catalysis is not damaged, it can be passed by directly lifting the combustion.

There are 1 cleaning three-way catalysis 2Clean the oxygen sensor 3Directly improve fuel quality4To clean the oil circuit, use Add 5Find someone to check on behalf of 6High-efficiency and alkaline cleaners to clean the combustion chamber – not recommended and can damage the piston rings and oil seals.

To clean the oil circuit, the company has a general fuel additive cleaning two-way curing agent can prevent and remove carbon deposits in the oil circuit, prevent car shaking, and prevent abnormal automobile exhaust.

Carbon deposits can cause insufficient combustion of gasoline, causing engine shake 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.

Main causes of idle jitter:

1.Serious engine carbon deposits: Cars always have the problem of carbon deposits, including cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc.

When the engine has too much carbon deposit, it will affect the ignition energy, air intake efficiency and air-fuel ratio of the car, resulting in the unstable power output of the car, and the phenomenon of idle speed and acceleration jitter appears.

2.Unstable oil pressure: If you have cleaned the engine carbon deposits, cleaned the throttle, replaced the oil gasket and spark plug, etc.

And when idling, you still find that the body shakes, it is recommended that you go to the 4S shop to check whether the oil 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, it will cause the body to shake.

3.Engine cylinder shortage: Engine cylinder deficiency mainly refers to the engine one or more cylinders are not working properly, which is generally manifested as:

The exhaust gas flowing out of the car is obviously intermittent, and the exhaust pipe shakes violently, and the engine shakes clearly, sometimes accompanied by abnormal noises. This is mostly related to ignition coil failure.

4.Aging of engine parts: Shake in the car is also associated with the aging of the engine feet (also known as claw pads).

The engine foot is actually the shock absorber system of the engine. The engine feet are responsible for absorbing slight vibrations when the engine is running. If there is a problem with the engine base, these vibrations can be transmitted to the steering wheel and cab, causing vibrations at idle.

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.

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 deposits. The 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 starting, and the more carbon deposits will affect cold starting.

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 whether there is a fault in the ignition tether system and whether the spark plug has too much carbon.

3. The oil pressure is unstable. If you have cleaned the carbon deposits in the engine, 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.

4. 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 beginning of 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 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 lead to no good fuel can 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.

The reasons for the severe engine shaking and unstable idle speed are: 1. The engine has too much carbon deposit, and when the internal carbon deposit of the engine is too much, the gasoline sprayed by the fuel injector of the starting vehicle has too much carbon deposit, and the mixture is too thin, and it is difficult to start. The vehicle is easy to start until the gasoline absorbed by the carbon deposits reaches saturation.

2. If the air filter is not replaced in time, it will cause insufficient air intake, and the engine will shake due to the drop in engine idling; 3. The ignition energy is low, the temperature of the cherry blossom circle in the engine is not enough when the vehicle starts cold, and the fuel injection spike song is sprayed more to meet the power requirements when the vehicle is cold started. The fuel requires higher ignition energy, and the ignition energy decreases when the spark plug gap increases, which affects the dynamics and causes the vehicle to shake and move. 4. The water temperature is abnormal, the ignition of the engine water temperature is high, the oil-gas mixing ratio changes, and the viscosity of the oil becomes thinner (poor lubricity).

Poor engine idle speed includes: incorrect idle speed, idle speed is too low, too high, idle speed is not soft, idle speed is unstable, etc. The construction principle of EFI engine is very different from that of carburetor engine, and the causes of poor idle failure are many and complex, which increases the difficulty of fault diagnosis and troubleshooting.

Shaking when the car is idling is a common problem of all kinds of cars, especially after the cold start, it is more likely to idle unstable or the body shakes. The most fundamental cause of the jitter phenomenon is poor combustion in the cylinder. If the combustion is not good, the power provided by the car will not be enough, and the car will shake.

Common causes of unstable car idling and jitter:

1. Inappropriate mixing ratio leads to jitter.

If the oil-gas mixing ratio in the engine compartment of the car is not adjusted accurately, the car will easily shake. In a closed-loop controlled car, the minimum operating temperature of the oxygen sensor is 370 degrees Celsius, and if the car is just started, the oxygen sensor does not work because the temperature in the exhaust pipe does not reach 370 degrees Celsius. At this time, the ECU misjudges, and the control of the oil and gas mixing and ignition time through the actuator has an error, thereby reducing the power output of the car and causing shaking.

Second, the ignition energy is low and causes jitter.

The first problem faced by the car when it starts cold is low temperature, the temperature in the engine is not enough, and the temperature of fuel and lubricating oil is not enough, so more fuel should be injected to meet the requirements of power during cold start. The greater the gap between the spark plugs, the smaller the ignition energy. When the fuel atomization is not good at low temperature, the fuel needs higher ignition energy, and the ignition gap of the spark plug is easy to become larger when the car is used for a long time, resulting in a decrease in ignition energy, which affects the dynamics and makes the car shake.

Reason 1: The engine lacks cylinders.

Engine cylinder lack mainly refers to the engine has one or more cylinders do not work normally, the general performance is: the exhaust gas flow of the car has obvious intermittent, and the exhaust pipe shakes to suppress the stuffiness, can clearly feel the engine shaking, sometimes accompanied by a sudden sound. This is mostly related to ignition coil failure.

Reason 2: The machine foot glue is aging or loose.

The foot glue is the rubber block between the engine and the frame. Its function is to reduce the vibration and cushioning of the engine when working, and to have the effect of fixing the engine. Once these feet are aged or loose, the engine shakes dramatically.

The effect will be much weaker after this re-replacement of the foot glue.

Reason 3: Carbon deposition.

When the carbon deposit inside the engine is too much, the ignition energy, intake efficiency, and mixture ratio of the car will be affected, resulting in the unstable power output of the car, and the shaking phenomenon will occur at idle speed and acceleration. This is recommended to go to the 4S shop for the engine cleaning project.

Reason 4: The fuel system is too balanced.

Adding an inappropriate fuel label (e.g., 93 to 90) will result in a decrease in the output of the car and a decrease in power; Or due to the blockage of the vent hole of the fuel tank cap, the fuel tank switch, the fuel filter and the oil pipe between the fuel tank and the carburetor are partially blocked, which cannot meet the required oil volume, resulting in the mixture being too thin and the engine shaking. It is recommended to use the fuel label specified by the manufacturer and maintain it regularly.

Hello When the engine starts, the car is not moving, the computer must be stable, the engine is shaking, check the spark plugs.

Brother, according to what you said, I feel that the idle instability caused by the throttle, the carbon accumulation of the throttle, you remove the throttle and clean the front and back, it should be solved.

Hello, clean the throttle, change the spark plug, and that's it. Hope it helps! [If you have a problem with the car, ask the car master.] 4S shop professional technician, 10 minutes to solve. 】

Check the air intake system and fuel injection head [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Causes of jitter at idle:

1.The engine has serious carbon deposits.

The most common cause of car shake is a dirty throttle or excessive carbon build-up in the fuel injector. When the carbon deposit inside the engine is too much, the gasoline sprayed out by the cold start fuel injection head will be absorbed by the carbon deposit 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 the carbon deposit is saturated, it is easy to get on the car, and the gasoline adsorbed on the carbon deposit 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.

2.Problems with the ignition system.

Check the working condition of the spark plug, high-voltage wire and ignition coil, the ignition system and spark plug are not working well, and the poor working condition of the ignition system and spark plug will also lead to this kind of failure.

3.The oil pressure is unstable.

If you have cleaned the engine carbon deposit, washed the throttle, replaced the spark plug, etc., and still found that the body shakes when idling, it is recommended to check whether the fuel supply pressure and intake pressure sensor are normal.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the problems caused by the above-mentioned accumulation of silver carbon. 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 slurry of the oil circuit, which will continue to pollute the fresh fuel, resulting in no good fuel to participate in the combustion in the later stage, and the carbon deposition exceeds the standard, which is especially common for the National VI car. We can only gradually alleviate most of the problems by maintaining clean oil circuits.