What is the cause of the bad idle jitter, and what is the cause of the idle jitter

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 fumes coming out of the car are obviously intermittent, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, 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.

What is the cause of the engine shaking when the car idles unsteadily?

I have a better answer.

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. Let's take a look at 6 reasons why cars are unstable and shake at idle. Causes of unstable and shaky car idling 1:

An inappropriate mixing ratio can lead 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.

The cause of unstable and jitter of the car at idle speed is 2: 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.

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.

The cause of unstable idle jitter of the car 3: the jitter caused by the different working conditions of each cylinder.

Similarly, spark plugs in multi-cylinder engines will have the above problems. After a long period of use, the ignition gap and time control of the spark plug will be different, but the ECU cannot diagnose this deviation and still treats "them" equally, which leads to practical and theoretical errors, and as a result, some cylinders produce less power, which will lead to jitter.

After the engine is used for a long time, the gap between each cylinder liner and the piston will also be more or less different, that is, some have a large gap and some have a small gap. In the cold start, there is no good oil lubrication, and the cylinder with a large gap is easy to leak a certain amount of high-temperature gas from the gap, thus reducing the power output.

Cause 4 of unstable idle jitter of the car: Shake caused by carbon deposits in the valve and intake tract.

1.The spark plug is caused by the fact that the gap is too large for a long time or there is carbon deposit, internal damage, etc.;

2.The ignition coil of one of the cylinders was damaged, causing this cylinder to not work properly;

3.The internal short circuit of the gasoline pump makes the low-pressure fuel unable to reach the ** gasoline pressure normally, causing the engine to shake or stall;

4.There is air leakage in the engine intake system, which causes the engine to shake;

5.In the cold car state, the throttle, valve, and piston top are caused by excessive carbon deposit;

6.One of the cylinders of the engine, due to the poor sealing of the valve or the piston ring is stuck by carbon deposits, there is no cylinder pressure, resulting in engine shaking.

How to deal with the failure of the ignition system of the car?

You can go to an ordinary repair shop and ask the mechanic to remove the spark plug to see if the head of the spark plug is dirty and whether the electrode head is damaged, which we can see by ourselves. The second is to use a diagnostic instrument to check whether the high-voltage coil or ignition coil is not working.

What to do if the engine is shaking at idle.

Throttle valves, spark plugs, carbon deposits in the intake tract, impure or overloaded fuel, the size of the fuel injection, etc.

Hello, the engine shakes badly when idling, this phenomenon indicates that the engine has an abnormal phenomenon, it is recommended to check, first to determine whether a cylinder of the engine is working normally, and secondly, to check the specific reason.

Clean the throttle and idle the motor.

There are several reasons for engine shake:

1. The engine has serious carbon deposits, and the most common cars with serious shake are the injectors, the throttle valve is too dirty or too much carbon deposits, and the hand is wide;

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 buildup on the throttle or fuel 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 unstable. If 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 chain judge 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.

There are mainly the following reasons for the severe idle jitter: 1. Spark plug problem: If the spark plug of the automobile ignition system fails, it will cause problems such as poor ignition system work and poor spark plug flashing, and it will also lead to unstable faults such as jitter when the car is idling.

2. Fuel quality problems: Poor fuel quality will damage the performance of the engine, so it will cause the problem of idle fighting and shaking. 3. There are many carbon deposition beams in the engine

If there is too much carbon inside the engine, the gasoline emitted from the cold start injector will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin and making it difficult to start.

Hello, this is generally caused by the throttle is too dirty, it is recommended that you go to the repair shop to clean the throttle.

If the idle speed of the car shakes badly, it is recommended to clean up the engine carbon deposits, and it should be better.

What to do if the engine is shaking at idle.

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.

See if it's low idling. Clean the idle motor and pipes if it doesn't work.

Idling shakes badly, what's going on This problem is not caused by accessories, so it can't be repaired, it can only be cleaned, and cleaning is not covered by the warranty. It shows that this is not a big problem, as long as you use Si Youpu fuel additive additive fuel tank 2 to run two tanks of oil. In fact, gas stations regularly clean underground oil tanks, not to mention fuel tanks, which are caused by poor combustion, that is, the oil circuit is a little dirty and there is no big problem.

There are four main causes of body shake 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.

In addition, the lower the temperature, the greater the amount of oil required for the cold start, and the more the presence of carbon deposits will affect the smooth cold start. The solution is to clean the oil circuit and check whether the idle motor has carbon deposits that should be cleaned.

2.Problems with the ignition system.

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 is not in good condition and the spark plug is not in good condition. The solution is to check the spark plug for excessive carbon accumulation and replace the spark plug.

3.The oil pressure is unstable.

If you have cleaned the engine charcoal, washed the throttle, changed the oil cushion 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 is wrong and the work is not good, the body shakes will be caused by abnormal oil pump pressure pressure or wrong intake pressure sensor and poor work. The solution is to check the oil pressure and replace the parts if necessary.

4.Aging of engine components.

Car jitter is also associated with aging of the engine feet. 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.