The engine of the BMW 320 cold car shakes badly, and the hot car is fine

Most of the cold start jitter is caused by poor fuel combustion, the fuel tank has more gum moisture, too much carbon deposition inside the engine, 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. The gasoline emitted by the cold start injector will be absorbed by carbon deposits, resulting in a dilute mixture for the cold start, which makes the start jitter.

If carbon deposits occur in the valves and intake tracts of the engine, the ECU will make an error in judgment because the carbon deposits 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.

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.

The problem of unstable idling of cool cars may be caused by excessive carbon deposits in the air intake, intake valves, and combustion chambers. Not only do you have to check and clean the throttle, idle motor, and fuel injector; It is also necessary to check the air intake, because the carbon deposit and dirt in the air intake tract are excessive, and the cross-sectional area of the air channel changes, so that the control unit can not accurately control the idle air intake, resulting in the mixture being too thick or too thin, coupled with the low temperature in the recent morning, resulting in poor atomization of the mixture, resulting in abnormal combustion or engine shaking after starting. Also check whether the spark plug has too much carbon deposit.

There is also the problem of noise in the cool car you said, which should be caused by the poor lubrication of the engine when the engine is low temperature, and the viscosity of the engine is large, I hope mine will help you.

Hello, this is normal, please feel free to use it.

Hello, it is advisable to check the lower throttle. If mine is helpful to you, please set it to the best.

This is normal, so please feel free to use it.

There are several main causes of cold car start-up jitter: carbon deposit, weak ignition, low cylinder pressure, unqualified fuel, etc.

The reasons for this are described in more detail:

1: Too much carbon deposition in the throttle, fuel injector, and intake tract, which may be one or all of them.

2: When there is too much carbon deposition inside the engine, 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 and making the start shake.

3: Ignition coil, spark plug, fuel injector and other mechanical failures, resulting in lack of cylinder.

4: Low oil pressure or cylinder pressure, resulting in insufficient power, etc.

5: The fuel quality is unqualified.

6: The idle control valve is damaged or too dirty.

7: Air leak in the intake manifold.

8: Damage to the engine arm or claw pad, etc.

9: The oxidation or grade of the engine oil is low, mainly due to poor fluidity at low temperature, and the cold start protection of the engine is not in place.

The reasons for the shaking of the BMW 320 cool car lighter engine are: 1. The spark plug is affected by the internal damage and other conditions due to the large replacement gap or carbon deposition for a long time. 2. The ignition coil of one of the cylinders is damaged, which affects the normal operation of the cylinder.

3. The internal short circuit of the gasoline pump makes the low-pressure fuel unacceptable to the normal gasoline pressure that affects the engine to shake or stall. 4. There is air leakage in the engine intake system, which causes the engine to tremble and vibrate. 5. In the cold car state, the throttle, valve, and piston top are affected by excessive carbon deposit.

6. One of the cylinders of the engine, because the valve is not tightly sealed or the piston ring is stuck by carbon deposits, there is cylinder pressure, which affects the engine to tremble and vibrate.

The reasons for the idle and jitter of the BMW 330i cold car are as follows: 1. It may be caused by poor working conditions of the spark plug, breakdown and flashing of the high-voltage line, poor contact of the distributor, blockage of the fuel injector, poor fuel atomization, and carbon deposition in the combustion chamber, causing the valve to jam and stagnation; 2. It may also be caused by low temperature and low fluidity of the oil, which is caused by poor lubrication, and this phenomenon will disappear after the temperature rises; 3. The above are the main reasons for shaking, as well as the damage of the shock-absorbing rubber pier of the engine, which will also cause the body of the car to shake.

What's going on with the BMW 3 Series cold car idle jitter? The reasons why the BMW 3 Series cold car idles and shakes are as follows:

1. The first thing to do in general idle trembling is to distinguish whether the idle speed is too low or caused by the lack of cylinder, which may be caused by these two types;

2. If the idle speed is too low, you can clean the idle valve and throttle, and then if it doesn't work, you need to use the computer to check the data flow to see if there is any problem with the air intake;

3. If there is a lack of cylinder, it is necessary to overhaul the fuel injection system, ignition system, cylinder pressure and timing, and it is best to go to a professional repair shop to deal with it.

There are several main reasons for the start-up jitter of the BMW 328 cold car: carbon deposit, weak ignition, low cylinder pressure, unqualified fuel, etc. It is recommended to go to the 4S shop to find the reason and repair it.

The specific reasons for the starting shake of the BMW 328 cold car are as follows:

1.Excessive carbon build-up in the throttle, injectors, and air intakes may be one of them, but also pera may be all.

2.When there is too much carbon inside the engine, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposits, resulting in a thin cold start mixture and shaking the start.

3.Mechanical failures such as ignition coils, spark plugs, injectors, etc. , resulting in a shortage of gas cylinders.

4.Low oil pressure or low cylinder pressure resulting in insufficient power, etc.

5.The fuel quality is not up to standard.

6.The idle control valve is damaged or dirty.

7.The intake manifold is leaking.

8.Damage to the engine arm or claw pads, etc.

9.The oxidation or low grade of the engine oil is mainly due to poor fluidity at low temperatures and insufficient cold start protection of the engine.

If there are any of the above reasons, it is recommended to go to the 4S store as soon as possible to check and maintain the car, and pay attention to regular maintenance of the car.

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