There is a slight intermittent shake in the engine idle speed Do you have it?

Car idling has a cold car idling in place (hot car) or a car idling in place after a period of time, in short, the car idling has a slight jitter, especially after driving a distance.

Hands on the steering wheel can feel a noticeable slight shaking, at this time there will be a clear contrast after turning off the engine, if it is a slight shaking, this is normal, do not panic. If it is intermittent jitter, there are the following problems that need to be paid attention to by the car owner for the car owner's reference.

Idle operation of the EFI engine:

Most of them are controlled by the idle control valve, and the ECU will control the opening of the idle control valve according to the engine speed, temperature, throttle switch and other signals, so as to maintain the stability of the engine idling. If a failure occurs, the air intake will be unevenly distributed, the power will fluctuate when the engine is idling, and the vehicle will shake.

The carbon deposits here include cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc., these positions are just closely related to the power output of the engine, when the carbon deposits inside the engine are too much, the ignition energy of the car is reduced, and the intake efficiency decreases, which ultimately leads to the unstable power output of the engine, idle shaking, and weak acceleration.

1. Check whether the ignition system is faulty. Generally, it is caused by the ignition coil or the aging of the spark plug, and the damaged ignition coil or spark plug can be replaced. The inspection of the ignition coil needs to use the computer to read the specific fault code, if the corresponding cylinder has a misfire, it is generally a problem with the ignition coil.

2. There is too much carbon deposition in the engine. In this case, it is recommended to clean the carbon deposits in the engine, especially the carbon deposits in the intake tract and cylinder of the throttle. The carbon deposits in the cylinder are mainly the piston position and the valve base position, and then rematch the throttle.

3. Oil circuit failure. In this regard, it is necessary to check whether the fuel supply pressure of the gasoline pump is normal, and if the oil supply pressure is unstable, it is necessary to replace the new gasoline pump in time.

1. The lack of cylinders in the engine, the lack of cylinders in the engine mainly refers to the fact that the engine has one or more cylinders that are not working normally, which is generally manifested as: the exhaust gas flow discharged by the car has obvious intermittent intermittentness, and the exhaust pipe shakes violently, and the shaking of the engine can be clearly felt, sometimes accompanied by a sudden sound. This is mostly related to ignition coil failure;

2. Carbon deposition problems include cylinder carbon deposition, throttle carbon deposition, spark plug carbon deposition, intake carbon deposition, etc., these positions are just closely related to the power output of the engine, when the carbon deposition inside the engine is excessive, the ignition energy of the car is reduced, and the air intake efficiency decreases, which eventually leads to the engine shaking, acceleration weakness symptoms;

3. Fuel system failure, adding inappropriate fuel labels (for example, No. 93 to No. 90), resulting in a decrease in the output power of the car and a decrease in power; Or due to the blockage of the vent of the fuel tank cover, 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;

4. Air intake system failure, air is one of the power of the engine, if the air filter is not cleaned in time for a long time, the lack of air volume will cause the combustible mixture to be too thick, so that the engine power decreases; In the case of a vehicle with a turbocharger, a failure of the supercharger can also cause the engine to shake during acceleration.

A non-negligible cause is "carbon deposition", which will 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 fuel filter element is blocked, and the oil path is not smooth;

The governor is worn and loose;

rack or trolley hairpins;

The oil pump is aging and the oil supply is unreliable;

Inaccurate oil supply time;

The grease nozzle is stuck and the atomization is poor;

The cylinder is worn, and the cylinder pressure is unstable;

Loose valve closing; ......

Engine Idle Intermittent Jitter This problem is caused by inappropriate combustion emissions detected by the sensor. It's not a big problem, as long as you start with a clean oil circuit. If it is a new car, it is not a problem with accessories, because the oil circuit is not clean for a long time or the fuel at the gas station will also cause the oil to become dirty, because the gas station is to clean the oil tank, so the private car must also be clean.

Long-term combustion is not good is carbon deposit, the exhaust pipe is black (direct injection car), the solution is very simple, the fuel tank plus the company has general additives, once clean the oil impurities tape and moisture, if the oil carbon deposition price is large, you can use it more once.

Reason:

1. Throttle carbon deposition, the first thing we think of is throttle carbon deposition, but the most unlikely place is the throttle, the intake valve directly affects the air intake of the car, thereby affecting the amount of fuel injection of the car, which is a very important department.

However, it is not very likely that the throttle valve will be blocked or the air intake will be reduced due to carbon deposition. Unless it's a car that has driven about 5,100,000, I recommend cleaning the throttle.

2. Carbon deposition on the fuel injector, which is the most likely part of the fuel injection caused by carbon deposition, should be checked in time or replaced as appropriate.

3. Ignition coil and spark plug, if there is a problem with these two gadgets, it is most likely to cause a lack of cylinder, the engine loses its power balance, the shaking is not negotiable, and the power decreases.

4. The oil supply system is faulty or the oil circuit is blocked.

No.

Engine intake pipe leakage: There are many intake manifolds or various valves in the intake system, and the leakage will cause the gas that should not enter, resulting in the concentration of mixed gas in the intake manifold being too high or too low, and eventually causing the engine to have intermittent shaking or weakness at idle.

Due to the blockage of the vent of the fuel tank cap, the fuel tank switch, fuel filter and the oil pipe between the fuel tank and the carburetor are partially blocked, resulting in the car not being able to get the corresponding fuel volume when idling, resulting in the mixture will become thinner, the engine power output will become weaker, and the idle speed will shake.

Precautions for engine idling.

Observe the degree of shake of the engine block, you can also ** the degree of shaking of the dipstick, the smooth dipstick handle is very clear, and the shake dipstick looks double.

From the engine tachometer or reading data block, the rpm shakes around the idle expected value, or shakes violently on the side of the expected value, and the idle expected value in the program includes the standard idle value, the load (turn on the lights, the automatic transmission is in gear, etc.), the idle value of the air conditioner, and the idle value of the warm car.

Hello, intermittent engine shake can come from a dirty throttle valve, or a dirty fuel injector, or due to a problem with the oil quality, or due to a poor ignition due to too large (or too small) spark plug clearance. Hope it helps. [Car questions, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】

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.

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 abnormal work of one or more cylinders of the engine, 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 that starts this Zen machine. 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 the combustion in the later stage, and the carbon deposition exceeds the standard. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

Causes of intermittent engine shake and vibration during idle time include:1Excessive carbon deposition in the engine; 2.

There is a problem with the ignition system; 3.The oil pressure is unstable, and the oil pump cannot supply oil immediately; 4.insufficient pressure in the engine cylinders; 5.

When the car is cold, the additional air valve is not open or the opening is too small; 6.The injector is poorly atomized or partially clogged. An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, electric motors, etc.

Normally, the internal combustion engine converts the chemical energy into mechanical energy. An engine can be used for power generation or as a complete unit including a power unit.

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 chain carbon deposits in engine emissions absorb carbon from the gasoline of the cold-start injector, which results in 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. When the mixture is thin and sometimes thick, it will cause idle shaking after the cold starter. 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 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.