What s the deal with a slight jitter at idle

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 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.

A slight shake in the idle speed of the car may be a dirty throttle, but it may also be caused by other reasons. The shaking of the car should not be taken lightly, and if it is not dealt with in time, it is very likely to lead to serious failure.

First of all, the most obvious reason is that the throttle valve is too dirty or the fuel injector has too much carbon, which causes the mixture to be too thin for cold starts, which makes it difficult to start. If this is the case, the throttle or fuel injector should be cleaned, and the oil circuit should also be cleaned, and the idle motor should be checked for carbon deposits, and if so, it should also be cleaned.

The second is the problem of the ignition system, the spark plug has too much carbon, resulting in poor ignition system work, which affects the working condition of the whole vehicle, therefore, the spark plug needs to be cleaned by carbon deposit.

Then there is the unstable oil pressure, which mostly occurs on the sensor. There are many sensors in automobiles, such as fuel supply pressure and intake pressure sensors, etc., if there is a problem, it will also cause the car to shake, and in serious cases, it will be necessary to replace the parts.

Finally, the aging of engine components, such as the aging of the engine feet, affects the engine's suspension system, which transmits vibrations to the steering wheel and cab, causing shaking at idle.

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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; If it is a vehicle with a turbocharger, the failure of the supercharger will also cause the engine to shake during acceleration;

It should be carbon deposit, it is recommended that you add a bottle of fuel additives, add 95 gasoline to try, and try to increase the speed shift as much as possible during driving.

The engine idles up and down 50 rpm normally.

How many kilometers. If you need to clean the throttle valve, check the spark plug, gasoline filter, and the 4S shop maintenance technician will answer for you.

The specific causes and solutions of unstable idling after the car starts:

1.Intake manifold leakage: When the air, gasoline vapor and combustion exhaust gases that should not enter the intake manifold, the mixture is too thick or too thin, resulting in unstable idling of the car.

Solution: Check the manifold and replace it in time if there is any air leakage.

2.Excessive carbon deposition on the throttle: excessive carbon deposition on the throttle and surrounding air intakes, and changes in the cross-sectional area of the airway, which makes the control unit (check the transaction price|Matching|preferential policies) cannot accurately control the idle air intake, which also causes the mixture to be too thick or too thin, resulting in unstable car idling.

Solution: Clean up the carbon deposits on the throttle regularly.

3.Air intake system actuator failure: There are many actuators in the engine air intake system, such as throttle motors, idle stepper motors, duty cycle solenoid valves, air flow meters, intake pressure sensors, etc. This causes the car to idle unsteadily.

Solution: Inspect the executive parts of the air intake system and repair or replace the faulty parts.

4.Fuel system failure: Faults such as clogged injectors, clogged fuel filters, clogged fuel pump filters, faulty fuel pressure regulators, and clogged fuel return lines can all lead to incorrect fuel injection, resulting in over-concentrated or over-thin mixtures, resulting in unstable car idling.

Solution: Clean or replace fuel nozzles, fuel filters, fuel pump filters, fuel pressure regulators, return lines, etc.

5.Ignition system failure: ignition module failure, incorrect spark bend plug clearance, spark plug electrode ablation or damage, high voltage line resistance and other faults lead to the ignition spark energy decline or fire, resulting in unstable car idling.

Solution: Clean or replace the ignition module and spark plug.

In order to ensure the normal and safe passage of the car, it is necessary to use PNF cleaners for regular maintenance;

The functions of car maintenance are:

1. Keep the car clean and tidy, the technical condition is normal, and eliminate hidden dangers;

2.Prevent cavity troubles and stop failures, slow down the process of deterioration and specialization, and prolong the service life;

3.Ensure that the vehicle is in good performance condition;

4.Effectively improve the efficiency of the vehicle and reduce the consumption of parts and tires.

Today, I will explain to you the relevant knowledge of "what is the cause of acorns when there is a slight jitter at idle". Generally speaking, it is normal for the car to shake slightly, but when the shake is more severe, you need to pay attention. Minor jitter can be the cause of severe engine deposits, ignition system problems, unstable oil pressure, and aging engine components.

It is very common for a car to shake when it is idling. Generally, the reasons for the shaking of the car are:1

The engine has serious carbon deposits, the throttle is too dirty, or the fuel injector has too much carbon deposit. When the carbon deposition of the engine is too serious, the carbon deposition will absorb a large amount of gasoline sprayed by the cold start fuel injector, resulting in the mixture being too thin, resulting in the difficulty of starting the car. 2.

Ignition system issues, which require checking the condition of the ignition coil, high-voltage wires, and spark plugs. When the ignition system is poor, the spark plug is not good to jump the fire is the cause of the idle shake of the car. 3.

If the oil pressure is unstable, if the engine carbon deposition problem and ignition system problem have been ruled out, and the body still shakes when idling, it is necessary to check whether there is a problem with the oil supply pressure and the intake pressure sensor, etc., and the abnormal oil supply pressure or the failure and abnormal operation of the intake pressure sensor are the causes of the jitter. 4. Aging of engine partsEngine parts engine feet are aging, engine feet are the shock absorption system of the engine, responsible for absorbing the subtle shake caused by engine work, when the engine foot fails, the steering wheel and cab will feel the vibration, and the shaking occurs when idling.

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Generally speaking, it is normal for the car to shake slightly, but you should pay attention when the shaking is severe. Minor shaking can lead to serious carbon deposits in the engine, ignition system problems, unstable oil pressure, and aging of engine components.

Car idle jitter is very common. Usually, the car shakes because:

1.The engine has a lot of carbon deposits, the throttle is too dirty, or the injectors are too much carbon. When the carbon deposition in the engine is too severe, the carbon deposition will absorb a large amount of gasoline from the cold start fuel injector, making the mixture too thin and the car difficult to start.

Generally, it is not easy to drive until the gasoline absorbed by carbon deposits reaches saturation. When the car starts, the vacuum suction of the engine sucks the gasoline on the carbon deposits into the cylinder and burns it, causing the mixture to become thick again. Because the engine mixture is sometimes thin and sometimes thick, it can cause idle jitter.

2.There is a problem with the ignition system. It is necessary to check the ignition coil, high-voltage wire, and spark plug. A bad ignition system and a bad spark plug are the reasons for the idle jitter.

3.The oil pressure is unstable. If the problems with the engine carbon deposit and ignition system have been ruled out, the body will still shake at idle.

It is necessary to check whether there is any problem with the oil supply pressure and inlet pressure sensors, etc. Abnormal oil supply pressure or faulty and abnormal operation of the inlet pressure sensor are the causes of jitter.

4.Aging of engine componentsThe engine base is aging. The engine foot is the shock-absorbing system of the engine and is responsible for absorbing the slight vibrations generated by the engine when it is working. When the engine feet fail, the steering wheel and cab feel the vibration, and when idling, the vibration occurs.

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; If it is a vehicle with a turbocharger, the failure of the supercharger will also cause the engine to shake during acceleration;

As long as the water temperature is normal, it's fine. No problem, it was cool in the morning or for a long time to park the car, and the engine water temperature did not reach the normal temperature. The mixture supplied by the engine computer is thick, and the oil supply is small, which cannot meet the lubrication requirements, so the speed is high and the sound is loud or the work is unstable and the exhaust smell is large, and as the engine gradually heats up, it slowly returns to the normal idle speed.