Ask for advice, the new car shakes significantly when idling

The causes of car idle jitter may be: faulty spark plug or ignition coil; Incorrect valve timing; uneven compression of the cylinder;

The valve seal is not tight, and there is air leakage; poor fuel pressure; Fuel injector plugging leakage; leakage between the cooling system and the cylinder; Air flow.

Sensor failure.

Classification of unstable idling.

1.How to observe unstable idling.

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

The dipstick handle looks double; Observed from the engine tachometer or reading data block, the rpm is jitter centered on the idle expected value, or.

Sharp shaking on the expected side, the expected idle speed in the program includes the standard idle value, load (light on, automatic transmission.

Hang the upper gear, etc.) idle value, air conditioning idle value, warm car idle value; Start the engine on the spot and feel the body violently while sitting in the seat.

Dithering. 2.Classified according to the law of appearance.

Cold car (coolant temperature below 50) rhythmic instability; Hot cars (coolant temperatures above 50) are rhythmically unstable.

Irregular, violent shaking.

One, two. 3. Classification according to the degree of jitter.

Normal, with the expected value of 10r min shaking at idle speed; Generally unstable, with an expected idle speed of 20r min jitter; Seriously not.

Stable, exceeding the expected idle speed by 20r min jitter; Shake violently on the side of the idle expectation.

4.Categorized by reason association.

The direct cause refers to the dirty, worn, incorrect installation of mechanical parts, etc., which leads to the change of individual cylinder power, resulting in each.

The power of the cylinder is unbalanced, resulting in unstable idle speed of the engine; Indirect causes refer to the abnormal electronic control system of the engine, resulting in mixing.

Poor combustion of the combined gas makes it difficult to balance the power of each cylinder, resulting in unstable engine idling.

5.Classified by faulty system.

air intake system; ignition system; Motor.

Normal, the oil is too rubbish, I picked up the car like this, and now I have changed the Bosch spark plug and the third generation line of Lishuang, or shake, just change the oil.

There are engine aluminum alloy guards, and some are installed to see if they are scratched.

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

In the idle state, the body shakes, and checking these points can solve most of the problems.

The throttle is dirty, clean the throttle and try it.

It is recommended to clean the throttle!

Hello, how many kilometers is it normal to have a little jitter.

The idle jitter of the new car is normal. Generally, when the cold car is started, the speed will shake at 900-1100 rpm, and it will return to about 800 rpm to reach the normal level after preheating. If the idle vibration amplitude of the vehicle is too large, you must go to a repair shop or 4S shop and ask a professional to check it.

The reasons for the abnormal idle jitter of the car are as follows:1Severe carbon deposits:

If the carbon deposit in the vehicle is severe, the most obvious symptom is the idle shake of the vehicle, and the carbon deposit needs to be cleaned up. Generally speaking, every 20,000 kilometers of the car, it is necessary to clean up the carbon deposits, and pay attention to increasing the fuel quality when using the car to prevent carbon deposits. 2.

Ignition system failure: If the ignition system of the car fails, or the spark plug is damaged, the fuel cannot burn effectively in the cylinder, resulting in abnormal idle jitter of the car. In this case, go to the repair shop or 4S for a detailed inspection.

3.Injector failure: If the injector fails, the uneven amount of fuel injected into each cylinder of the engine will also cause the car to idle and shake, so the injector should be checked and repaired.

The most fundamental reason for the shaking phenomenon of cold start or waiting in neutral 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.

Causes of 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 in the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by a large amount of carbon deposits, resulting in too thin mixture, 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 is not in the right position or the intake pressure sensor is incorrect, it will also cause the body to shake at idle.

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.

Idle jitter is a common situation encountered by many car owners. If the owner starts the vehicle or stops the vehicle without turning off the engine, if the body shakes significantly, it may mean that the vehicle has one of the following four conditions, such as severe carbon deposits in the engine.

1.The most common cause of heavy carbon build-up in the engine that causes a car to shake is that the throttle is too dirty or the injector is too much carbon. When there is too much carbon deposition inside the engine, the gasoline emitted by the cold start injector will be absorbed by a large amount of carbon deposit, resulting in too thin cold start mixture and difficult starting.

In this case, it is easy to start the car only when the gasoline adsorbed with carbon deposits is saturated, and the gasoline adsorbed on the carbon deposits after starting the car 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 becomes thinner and thicker, resulting in a cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon will be deposited, which will affect the success of the cold start. Workaround:

Clean the oil circuit and check whether there is carbon deposit in the idle motor, which should be cleaned. 2.Ignition System Problems Check the working condition of the spark plugs, high-voltage wires, and ignition coils.

If the ignition system is not working properly, the spark plug can also cause this failure. Solution: Check the spark plug for excessive carbon deposition and replace the spark plug.

3.The oil pressure is unstable if you have cleaned the engine carbon deposits, cleaned the throttle, replaced the oil gasket and spark plug, etc. 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 value of the intake car pressure sensor is wrong and does not work well, it will cause the body to shake.

Solution: Check the oil pressure and replace the parts if necessary. 4.

Aging of engine parts, car jitter is also related to the aging of 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: Replace parts.

Millions of car purchase subsidies.

The engine is idling, shaking and slamming the world Sakura, what should I do to regret the bridge.

You have to check it out specifically.

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The reasons for the idle jitter of the new car may be as follows: 1. It may be caused by the spark plug, the larger the gap between the positive and negative electrodes of the spark plug, the smaller the surface area of the ignition point, which will lead to a decrease in the ignition energy required to compress the oil-gas mixture, resulting in a decrease in power, which will affect the dynamics and make the automobile engine shake; 2. Engine shake caused by oil-gas mix ratio, this phenomenon is common in old-fashioned carburetor vehicles, but if there is a problem with the computer of the EFI vehicle, this phenomenon will also occur; 3. The phenomenon of jitter in the new car also needs to be observed whether the jitter mainly appears in the cold car environment, or the hot car environment, under normal circumstances, the jitter will only become more and more slight with the increase in water temperature, and the jitter is the largest when the cold car is used to shake.

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.

The reasons for the idle jitter of the new car may be as follows: 1. It may be caused by the spark plug, the larger the gap between the positive and negative electrodes of the spark plug, the smaller the surface area of the ignition point, which will lead to a decrease in the ignition energy required to compress the oil-gas mixture, resulting in a decrease in power, which will affect the dynamics and make the automobile engine shake; 2. Engine shake caused by oil-gas mix ratio, this phenomenon is common in old-fashioned carburetor vehicles, but if there is a problem with the computer of the EFI vehicle, this phenomenon will also occur; 3. The phenomenon of jitter in the new car also needs to be observed whether the jitter mainly appears in the cold car environment, or the hot car environment, under normal circumstances, the jitter will only become more and more slight with the increase in water temperature, and the jitter is the largest when the cold car is used to shake.