The old Buick Yinglang cold car starts shaking or even stalling, and the hot car is normal, what s g

The jitter is that the idle speed is too small, first check whether the oil should be replaced, and it is best to go to the repair shop to check it.

The old Buick Yinglang cold car starts shaking or even stalling, and the hot car is normal, what's going on? There are generally several situations of engine idle jitter, gear start jitter, cold start, three-way catalytic temperature is not enough, the most common reason for serious engine carbon deposition causing car jitter is that the throttle valve is too dirty or the fuel injector is too much carbon deposit, because the gasoline adsorbed on the carbon deposit after the car is sucked into the cylinder by the engine for combustion, and the combustible mixture of the engine is dilute and thick, resulting in idle jitter after cold start. Workaround:

The company has a general cleaning oil circuit, check whether the idle motor has carbon deposits and should be cleaned.

Buick Yinglang's severe idle jitter may be due to the following reasons, if the following methods cannot be solved, it may be necessary to upgrade the car computer system. Air flow sensor failure, water temperature sensor failure, engine carbon deposition is generally manifested as valve and inlet carbon deposition, if these two carbon deposition, it will affect the ECU to make wrong judgments, resulting in less fuel injection, even if the mixed oil and gas are fully combusted, it can not ensure sufficient power, and jitter is inevitable.

At low temperatures, the temperature in the engine, fuel and lubricating oil are not enough, so more fuel should be injected during cold start to meet the requirements of power. 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.

The reason may be: the throttle is dirty or the idle shake caused by the failure of the throttle, when there is carbon deposited at the junction of the shaft of the throttle valve plate and the throttle body, resulting in the inaccurate opening of the throttle, it will idle jitter.

Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, and the cold start is not brought to the combustion chamber and then mixed in the fuel tank is driven into the combustion chamber, and the jitter caused by poor combustion.

There are several causes of 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.

Workaround: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.

Buick Yinglang cold car after the start of the engine may be the air flow sensor failure, the following methods can not be solved, may need to be upgraded to the car computer system, that is, flashing, ignition module damage or ignition module by the engine computer ignition reference signal line damage, this reason is more common in Buick cars.

The pressure of the fuel system is too low, such as low pressure of the oil pump, oil leakage in the pipeline, small power supply current, damage to the oil pressure regulator, etc.; Trigger the car anti-theft system, lock the engine, so that the engine can start, but can not run, release the key protrusion one or two to turn off, while the anti-theft light is on; The ignition switch is faulty, there is power on the ignition line when starting, and when the key is released, the power is cut off and the ignition suddenly goes out.

Buick Yinglang overnight start shake and stalling: first of all, we ruled out the problem of oil volume and battery power, so the reasons for the difficulty of cold start of the car are cold start injector does not inject fuel, coolant temperature sensor failure, air intake sensor failure, injector atomization poor, intake pipe carbon deposit, ignition energy is not enough, spark plug failure, idle control valve failure, etc.

The oil quality is poor, and the volatility of inferior fuel is very poor, especially in winter, when the temperature is low, when the cold car starts, the engine block temperature is low, and the fuel is difficult to atomize, resulting in the fuel injected into the cylinder can not be fully mixed with the air, resulting in difficulty in starting, or even not starting.

Excessive carbon deposition in the valves and intake ducts makes it difficult to start the car cold, and the ECU judgment is wrong because the carbon deposition can absorb the appropriate amount of fuel. 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), so even if the remaining 90 parts of the mixed oil and gas are fully combusted, the required power is also not achieved, and the phenomenon of jitter is inevitable.

The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start. Everywhere inside the engine, carbon deposits can have a bad impact on the normal operation of the engine.

Spark plug is not replaced in time is also a common factor, cold car start requires higher ignition energy, and spark plug after a certain mileage of its electrode gap will become larger, if it exceeds the standard after the spark energy will be greatly weakened, can not normally ignite the gas mixture in the cylinder (commonly known as lack of cylinder), it is naturally difficult to start.

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Hello, the cold stupid source mountain bike does not shake, and the hot car shakes because of the spark plug failure. The spark plug is also more important in the car, but if the spark plug fails in the belt, such as carbon deposit on the spark plug electrode or abnormal spark plug gap, and spark plug damage, etc., there are reasons. Fuel pressure failure.

If there is a problem with the fuel pressure, the fuel injection will also be reduced due to poor fuel atomization and other reasons, and the gas mixture will be too thin. It may also be mixed because the amount of fuel injected increases when the oil pressure is too high. Injector failure.

If the amount of oil injected by the injector is uneven, it will also cause an imbalance in the power of each cylinder. Hope it helps.