What s the deal with a cold start in a car? What is the reason why the car is cold and difficult to

Cold car start is when the engine water temperature is low, and the car is generally not started for a long time. For example, after parking at night, it is started the next morning, and the start at this time is usually called cold start.

The causes of a car's cold start are as follows:

1.High viscosity oil is used in winter.

2.Excessive carbon deposits in the air intake system and at the root of the intake valve cause the mixture concentration to be too thin during cold start.

3.The throttle valve is heavily dirty and the air intake is insufficient.

4.The speed of the starter is not up to the requirements.

5.The contact resistance of the connecting wire of the battery is too large; The battery is low.

6.The viscosity of the lubricating oil in the transmission is too thick, which causes too much resistance to the engine.

7.The cylinder compression pressure of the engine is insufficient.

8.The spark plug of the high-pressure ignition system is not good enough to produce an ideal EDM that can break down the mixture.

9.The spark plug is carried out unreasonably; Engine coolant temperature sensor malfunction.

Inspection and maintenance of liquid batteries.

1.Check the battery housing for leakage of electrolyte. If there is a leak, the battery should be replaced; If there is no leakage, the oxide on the surface of the battery and the poles of the battery should be cleaned with hot water, but care should be taken not to allow water to enter the inside of the battery through the vents.

After the water is dry, it is best to use sandpaper to polish the contact surface between the pole and the joint, and tighten the fixing screws on the joint to ensure that there is enough current to pass through when starting.

2.Check the voltage of the battery. Method:

When the engine temperature is normal and the starter is in good technical condition, the engine can be started smoothly several times in a row, indicating that the battery is in good condition and the voltage is normal. If the engine speed gradually decreases with each start, or the engine barely starts, it means that the voltage of the battery is in a state of loss and should be charged.

3.The specific gravity of the electrolyte and the level height should be checked. If the specific gravity of the electrolyte is too low, it cannot provide enough power, and it may freeze and crack the shell and be scrapped.

It should be noted that the sulfuric acid concentration in the electrolyte must be adjusted after the battery is fully charged, as too high sulfuric acid concentration will shorten the life of the battery. The level height of the electrolyte should be 10 to 15 cm higher than the upper edge of the plate. When the height is not enough, you should add distilled water or battery refill, and do not add electrolyte or tap water directly, which will cause the battery to be destroyed immediately.

Seasonal maintenance of the cooling system.

1.First of all, check whether there are traces of leakage in the drain hole, thermostat joint, upper and lower water pipe joints, water outlets, water tank covers and water storage tanks of the water pump from the appearance. If a leak is found, the cause should be eliminated immediately, and it must not be improvised.

2.To check the freezing point of the antifreeze. In general, the freezing point of the liquid antifreeze is 5 to 10 times lower than the minimum temperature in the area where the vehicle is traveling. For example, for vehicles in the Beijing area, the freezing point of antifreeze is between minus 25 and minus 30 to ensure a safe winter.

3.Note that the liquid level height of the antifreeze is generally about 10 mm away from the water tank filling port, or according to the standard scale on the water tank, add the same kind of antifreeze, do not add too much antifreeze or water, and leave sufficient thermal expansion space for the water tank.

4.Finally, check it out.

Cold start means that the engine has been turned off for a period of time, the temperature has been ** below the normal working temperature, and the oil has been reflowed, at this time the start is a cold start, so it may be a bit general, with data to explain to you, two hours of ignition, the engine temperature is lower than 40 degrees, at this time in the start is a cold start.

Cold start hurts the car more, according to the data, the engine more than 80 wear is in the cold start, cold start due to the low temperature, gasoline is not easy to burn resulting in vehicle start difficulty, followed by the oil to cover the engine everywhere, it takes a certain amount of time, at this time the engine is running without lubrication, the machinery rubs against each other will definitely make abnormal noise.

Extended Materials. Precautions.

It is very necessary to warm up the car, 60 seconds in situ in winter, 30 seconds in summer, some owners want to idle for half an hour every time the car is hot, which will not only increase fuel consumption, but also increase carbon deposition to the engine is harmful and not beneficial.

If you maintain the car in place, then the failure rate will be reduced, which can save us a lot of car maintenance costs, and you want to drive your car for a longer time, and the maintenance must not be slack.

I also saw it online, I hope it helps you.

1. Excessive carbon deposition leads to frequent failures.

When there is too much carbon deposition inside the engine, the gasoline ejected from the cold start injector will be absorbed by the carbon deposition, resulting in the cold start mixture being too thin, making it difficult to start until the gasoline absorbed by the carbon deposition is saturated, and it is easy to get started.

After the car is hit, the gasoline adsorbed on it will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture will become thicker, and the combustible mixture of the engine will be dilute and thick, resulting in idle shaking after cold start.

2. The engine is low-temperature.

The temperature in the engine is not enough, and the temperature of the fuel and lubricating oil is not enough, so more fuel should be injected during the cold start to meet the requirements of power. At low temperatures, the fuel atomization is not good, resulting in a decrease in ignition energy, which affects the dynamics and makes the car shake. Ignition energy can also be reduced by aging of the ignition coil, aging of the high-voltage wire of the spark plug, or leakage.

Extended Information: Precautions for Cars Difficult to Start in Cold Cars:

1. Pay attention to defogging. In winter, the temperature difference between the inside and outside of the car is large, and the fog on the car glass will bring a lot of trouble to driving, especially the front windshield and the front left and right windows. Therefore, it is particularly important to maintain the clarity of the glass when driving in foggy days in winter, and to clean the glass before traveling.

2. Prevent freezing. Frost and freezing of glass during the cold winter months is very common, mainly due to the large temperature difference between the inside and outside of the car. If you wash it with hot water, it will damage the paint and in severe cases, it may even cause the glass to burst.

Using cold water can also damage the paintwork, and frost can be worse afterwards. The correct method should be to turn on the car heater and use a special de-icing and frost shovel to slowly remove the ice in the same direction.

The cold start of the car refers to the start of the engine when the water temperature is low, and the reasons for the cold start of the car are as follows: 1. The throttle is too dirty or the fuel injector has too much carbon2. Fuel problem;3. The water temperature sensor fails4. The oil pressure is unstable;5. Aging of engine feet;6. Failure of spark plug or ignition coil. The way to deal with the cold start jitter of the car is:

1. Read the fault code or data stream to troubleshoot a sensor2. Check whether there is a problem with the exhaust valve;3. Check the spark plug, high-voltage line, ignition coil, fuel injector, timing mark, fuel pump pressure, cylinder pressure;4. Check whether there is a problem with the idle motor, and clean the throttle and idle motor.

The temperature in the engine is not enough: when the cold car starts, the temperature in the engine is about the same as the surrounding environment, the temperature at this time is not suitable for the engine to work, and the fuel atomization is not good in the low temperature environment, which leads to the decline of ignition energy, which affects the dynamics and makes the car shake, this phenomenon will occur more in winter, so in winter, the car can be parked in the garage, which can alleviate the phenomenon of engine shaking.

Cold start refers to the car in the case of direct start without preheating, driving without preheating, for the car, just start the oil has not lubricated the various parts of the engine, especially the crankshaft and crankshaft bearings, it is easy to strain, the driving capacity of the car will also decrease, and it will also shorten the service life of the engine. The best way to protect the engine is to preheat it in advance, run it for 5 to 10 minutes when the engine is not loaded, and the diesel engine will take 15 to 20 minutes, and the water temperature will be kept between 60 and 80 degrees, which is the optimal temperature.

A car cold start is when the car starts directly without preheating and driving without preheating. For automobiles, the oil has not been lubricated all parts of the engine when it is just started, especially the crankshaft and crankshaft pads are easy to strain, and the driving capacity of the car will also decrease, which will shorten the service life of the engine.

A cold start is when the engine starts up some time since it was last shut down and its internal temperature is in line with the ambient temperature. Corresponding to this is the hot start of the engine, which means that the engine is started shortly after the last shutdown time and there is still a high residual temperature inside it.

It seems like it's all like this. The tachometer has a bit of ups and downs. It would be nice if the water temperature came up a little. It's the same with other people's cars. Just take it as normal.

What are the reasons why the car is cold and difficult to start

1. Spark plugs.

A high ignition energy is required for cold starting, and the electrode gap of the spark plug will become larger after a certain mileage is used, if the electrode gap is found to be exceeded, replace the spark plug in time.

2. Clean the throttle.

Carbon deposits on the throat walls of the intake manifold will affect the amount of air intake, and carbon deposits behind the valves will adsorb fuel and affect gasoline atomization. If carbon deposits are detected, clean the inlet tract.

3. Check the gasoline pressure.

The low pressure of the gasoline pump makes it difficult to start due to insufficient oil supply. In this case, replace the gasoline pump or open and close the electric door several times to make it easier to start when the pressure of the gasoline pipe increases.

4. It is possible that the weather is cooler, and the mixed gas inside the engine is not atomized well.

It is also possible that the fuel pressure is low and the fuel injection atomization is poor and not easy to start, it is recommended to try it, open the key door to the instrument light is fully on, hear the sound of the oil pump, wait until the sound is over, close the key door, and then repeat the above operation, and then start it should be able to play at one time.

1. Check the status of the battery.

In most cases, the difficulty of starting the car in winter is caused by the loss of battery power or the expiration of the battery life. When the battery is low, the speed is weak when starting the car, and only the clicking sound is heard, and the clicking sound will gradually become a clicking sound when the ignition is lit again. Do not ignite continuously to avoid the battery running out.

2. Change the appropriate engine oil.

In winter, as the temperature drops, the viscosity of the oil increases, making it difficult for the oil to flow, which increases the resistance of the engine. If it is difficult to start, check whether the oil label is incorrect.

3. Replace the spark plug in time.

After a few years of use, spark plugs are prone to cause problems such as carbon deposition, leakage, excessive clearance, and ablation, which will cause difficulties in car ignition, cold start, and even hot engine start, and often need to be ignited multiple times. Therefore, when driving to a certain number of kilometers or feeling that the vehicle is difficult to start, weak, shaking, increasing fuel consumption, or inexplicably stalling, please check the spark plug status and replace it in time.

Strictly speaking, water temperature sensors are divided into two categories. Either way, it is a thermistor with a resistance between 275 ohms and 6500 ohms. Moreover, the lower the temperature, the higher the resistance, and the higher the temperature, the lower the resistance.

Yes. A cold start can hurt the car, because the engine temperature is relatively low, and starting the car at this time is not a wise choice.

Of course, because this practice can seriously damage many car systems and parts, which will lead to a reduction in the life of the car.

No, but it is important to warm up the car after starting it, and this will allow the car to operate normally.

Hello! Cold start refers to the car in the case of direct start without preheating, driving without preheating, for the car, just start the oil has not lubricated the various parts of the engine, especially the crankshaft and crankshaft bearings, it is easy to strain, the driving capacity of the car will also decrease, and it will also shorten the service life of the engine. The best way to protect the engine is to warm it up in advance, run it for 5 to 10 minutes without load on the engine, and 15 to 20 minutes for the diesel engine, and keep the water temperature between 60 and 80 degrees, which is the optimal temperature.

What does it mean to have a cold start in a car.

A cold-start engine usually doesn't start the car for a long time (e.g. after 4 hours of parking or after parking at night). After the car stops for 4 hours, the oil will fall back to the oil pan due to gravity. At this time, if the engine is started again, the oil cannot run quickly to reach all parts of the engine, resulting in dry friction wear, which is commonly known as cold start.

This wear accounts for more than 80% of engine wear. The car is not afraid to drive, but it is afraid of parking for too long. Of course, cold starts can be solved with engine protectors.

Such as graphene protectant. It is a 24-hour uninterrupted pure physical protection for the engine, and the graphene protective film formed on the surface of the engine is solid protection, which can effectively repair the wear and tear of the engine surface and enhance the engine power. Hope it helps.

Causes and solutions to the difficulty of cold start of automobiles:

First of all, check whether there is too much carbon at the throttle and idle valve, too much carbon will easily cause the idle airway to be blocked and then lead to poor air intake, so if there is too much carbon deposit, the old man first needs to clean the carbon deposit, and then check whether the water temperature sensor of the engine control system is working properly.

The reasons for the deterioration of the starting conditions at low temperatures: high viscosity of the oil, decrease of starting speed, decrease of ion concentration of the battery due to low temperature, decrease of ignition energy, reduction of molecular activity due to low temperature, and difficulty in forming flammable mixture. So it is difficult to start at low temperatures.