The car shakes when it starts, and it will be okay for a while, what s wrong?

There are four possible 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 deposit, washed the throttle, changed 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, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, the body shakes will be caused by abnormal oil pump supply pressure or wrong intake pressure sensor value and poor work.

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Ignition problems, air-fuel ratio problems.

Ignition problems: spark plug ablation or leakage, or the spark plug gap is not properly adjusted. The spark plug is a wearing part, used to a certain number of kilometers, generally need to be replaced, if there is a problem with the spark plug of a cylinder, it will cause the cylinder to burn abnormally.

Air-fuel ratio problem:

If there is too much carbon deposit, it will absorb a little fuel, so that the carbon deposit of the oil sprayed by the cold car is adsorbed when starting, and the mixing ratio is too thin, causing instability in starting. After the car is launched, the carbon fuel is released, resulting in an overly concentrated mixing ratio and an unstable mixing ratio, which of course will cause the engine speed to be unstable and cause shaking.

The EUC will control the mixing ratio and ignition angle according to some sensors, if there is a problem with the oxygen sensor, water temperature sensor, flow meter, pressure sensor, etc., or if there is a lack of antifreeze, the thermostat is broken, and the fan is faulty, it will also cause the air-fuel ratio to be incorrectly controlled and cause jitter.

The oil pump is broken, or the pipeline is blocked, resulting in unstable oil supply pressure, which will cause the proportion of oil supply to change, directly causing shaking.

Hello, dear! When the cold car starts, the car shakes a little for a while, this is too much carbon deposition inside the engine, and the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, resulting in the cold start mixture being too thin, making the start shake, because the carbon deposition can absorb the appropriate amount of fuel, the ECU judgment is wrong, and the cold car starts to shake for a while

1. If carbon deposition occurs in the valve and intake tract in the engine, the ECU judgment is wrong because the carbon deposition can absorb the appropriate amount of fuel. If the computer actually controls the injection of hypothetical 100 parts of oil and gas, but only 90 parts actually enter the cylinder (10 parts are absorbed by carbon deposits), then even if the remaining 90 parts of mixed oil and gas are fully combusted, this cannot achieve the required power, and the phenomenon of jitter is inevitable.

2. There are many reasons for the cold start jitter of the car: the spark plug is not in good working condition; The high-voltage line was broken down and flashed; Poor contact of distributors; The fuel injector is blocked, and the fuel atomization is not good; There is carbon deposition in the combustion chamber, which causes the valve to jam; Low temperature leads to oil condensation, low fluidity, poor lubrication, and disappears when the temperature rises. Damage to the engine's shock absorber pads can also cause the body to shake.

There are a variety of reasons:1The vehicle's air filter is dirty.

2.The spark plug is in time for replacement. 3.

The vehicle's engine thermostat is malfunctioning. 4.There was carbon deposits in the vehicles, and the oil system was blocked.

5.There is an open circuit in the engine's high-voltage wires. 6.

The engine's fuel injectors are clogged. 7.Added low-grade fuel.

If the vehicle has too much carbon deposit, it will also lead to unstable idling, the owner can clean the throttle of the vehicle, and the throttle valve needs to be removed when cleaning the throttle valve needs to be re-matched by the computer after cleaning, and the car will have a short time of fuel consumption rising after cleaning, and it will be stable after driving for a period of time.

It's normal for the engine to shake a little when the cold car is just started, and it doesn't matter if it doesn't shake after a minute or so.

The start-up jitter of the car may be caused by unstable idling.

The cylinder, throttle or fuel injector will produce some carbon deposits due to the quality of domestic fuel, resulting in the fuel mixture in the cylinder cannot achieve 1:1 between air and fuel, so it will shake when the cold car starts. Drive for 3 to 5 minutes on it.

The phenomenon of engine jitter will involve many reasons, such as excessive carbon deposition in the intake system such as throttle and idle valve, poor fuel injection atomization of the fuel injection nozzle, and poor working performance of the ignition system, which is mainly directly related to the working performance of the spark plug, high-voltage line and ignition coil, and then there is the phenomenon of idle jitter if the working performance of the relevant sensors is poor, such as water temperature sensor, air intake temperature sensor, air flow meter or manifold pressure sensor, etc. The specific reasons are recommended to combine the above analysis to the 4S store and conduct a closer on-site inspection, analysis and judgment of the vehicle according to the actual situation.

There are many reasons for car jitter, it can be too much carbon accumulation on the throttle, aging engine floor pads, or it can be a lack of cylinders in the engine. The lack of cylinder is caused by a faulty ignition system. The main components of the ignition system include the ignition coil and the spark plug.

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 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.

Here are some reasons why a car shiveres when it first starts:1. There is carbon deposition inside the engine.

2. There is a problem with the fuel supply system of the vehicle.

3. The idle motor of the vehicle is faulty.

If the engine is shaking, it should be overhauled in time, otherwise the vehicle is very prone to stalling after starting.

The shake cooker is used when the vehicle starts, and then the shake disappears after a while. There are probably the following reasons for this failure: First, most of this jitter is caused by carbon deposition in the vehicle engine, and it is recommended to go to the repair shop to clean the throttle, intake tract and valve base carbon deposition.

Then use the computer to rematch the throttle. Second, in this case, focus on checking the oil circuit, it may be that the fuel quality is too poor, or the fuel injector is blocked caused by the phenomenon of shaking, you can add some fuel treasure, or high-grade gasoline, do the oil circuit cleaning. The third is the wax shake caused by the decrease in the viscosity of the engine oil, which needs to be checked in time, whether the oil has reached the number of kilometers to be replaced?

Change the oil in a timely manner.

The reason why the car starts shaking and shaking the car is good after a while, and the car starts shaking for a while, and the reasons for the shaking after a while when the car starts are as follows: 1. The beam caused by low ignition energy, because the engine temperature, fuel and lubricating oil temperature are very low, then when the car is started cold, a thicker mixture is needed, and a thicker mixture needs a higher ignition energy, and if the ignition energy drops, then the car will tremble; 2. If the mixing ratio of the mixture is incorrect, at the time of starting, due to the large error of the signal of the individual engine sensor, the control of the ignition time will be errorized and the engine will shake; 3. Caused by the different working conditions of each cylinder, the ignition energy of each cylinder in the multi-cylinder engine is quite different, and the compression ratio is inconsistent due to the different wear degree of the piston rubber sail track and piston ring, which leads to the uneven power output of the engine, and the phenomenon of jitter occurs. @2019

The reasons why the car shakes for a while when starting are as follows: 1. The ignition energy is low, because the engine temperature, fuel and lubricating oil temperature are very low, so when the car is cold started, a thicker mixture is needed, and a thicker mixture needs higher ignition energy, and if the ignition energy decreases, then the car will tremble; 2. If the mixing ratio of the mixture is incorrect, at the time of starting, due to the large error of the signal of the individual engine sensor, the control of the ignition time will be errorized and the engine will shake; 3. Caused by the different working conditions of each cylinder, the ignition energy of each cylinder in the multi-cylinder engine is quite different, and the compression ratio is inconsistent due to the different wear degree of the piston and piston ring, which leads to the uneven power output of the engine, and the phenomenon of jitter occurs.