It is difficult to start the cold start of the EFI car, and what is the reason why the cold car of t

It's hard to start just these few things, the ignition timing is not accurate, the motor is weak, the cylinder pressure is insufficient and difficult to catch fire, your car has been a few years, and you haven't said it, whether it started like this or slowly, you didn't make it clear, but I want to remind you that the usual driving habits are also very important, step on the clutch and hit the motor when the car is cold in the morning, so that the motor will not drive the gearbox to turn, If you are really in a hurry to get on the road, you must stabilize the throttle with the first gear as far as possible (about 200 meters), Because in the morning, the oil has been refluxed to the oil pan after a night of precipitation, and it is slow because it is good for the oil pressure, and all parts of the machinery have not been fully lubricated, and the water temperature is a little higher and then pull the high speed, which is very good for the service life of the engine.

I suggest that you change the battery, then maintain the motor, change the spark plug, if you can't hit it again, ask someone to check the ignition time and timing, and finally measure the cylinder pressure.

Masters don't dare to be! I've been driving for almost 10 years, and when I first started driving, the petrol was only 61 liters a piece. Now I have children, so, help people drive buses.

The difficulty of cold starting of the car is caused by the failure of the ECU itself.

Install the faulty ECU of the car, unplug the water temperature sensor, start the engine in the cold car, and the car goes smoothly, but at this time the engine fault light is on, and the engine fault code is read as "13", indicating that the water temperature sensor is faulty, indicating that the ECU has started the fault-insurance system. Start according to the pre-stored value of 20, and measure the pre-stored starting fuel injection pulse width of 20 at this time. According to the previous inspection, the normal car engine starts the fuel injection pulse width at the temperature 30, and the car is measured at the current temperature of 30, the fuel injection pulse width is only, and it is concluded that at the same temperature, there is a certain difference between the starting fuel injection pulse width pre-stored in the ECU and the starting fuel injection pulse width provided by the water temperature sensor signal.

This reflects that the ECU detects the signal when the engine starts cold, and can not calculate the fuel injection pulse width required for the corresponding starting temperature, so that the fuel injection pulse width is reduced, resulting in the reduction of fuel injection during starting, and the concentration of the mixture becomes thinner, which does not meet the needs of the starting state, so it is necessary to start many times and wait for the mixture concentration to increase before landing.

The best way to solve the problem of cold car start: boil a pot of hot water and pour it on the engine cover, start it again and hit it. I have found a lot of repair shops for my car and can't fix it, but this method works, please point it out!!

See if the EPU is bright - sensor,

Check the water temperature sensor Hot car ignition is not the same as cold car ignition, and 4s will only do this?

Hello, didn't you check the air flow meter and oxygen sensor???

1.When the spark plug is started by moisture, if the choke is closed for too long, the gasoline in the cylinder will be too much and the spark plug will be damp. The treatment method is to open the choke door, unscrew the spark plug, open the spark plug hole, turn the engine, drain the gasoline in the cylinder, and then reinstall the spark plug, and then start the engine as usual.

2.If you find a lot of gasoline sticking around the spark plug when you remove it, the air filter may be severely clogged in addition to the reason why the choke is not open. At this time, the filter element of the air filter should be removed for cleaning, and the filter element should be replaced with a new part if it is rotten due to moisture.

3.Turn the engine with a leaking gasket, and carefully check the gasket between the cylinder head and the cylinder block for gasoline smell or hail leaks, if so, the cylinder gasket is leaking. The 4 compression nuts on the cylinder head should be checked first for looseness, and if they are loose, they should be tightened diagonally.

If there is still air leakage after tightening, the cylinder head should be removed, and the cylinder gasket should be checked for damage, and if it has been damaged, it should be replaced with a new part. If the air leakage is serious, check whether the cylinder head is damaged or deformed, and replace it if so.

4.Spark plug gasket leakage, spark plug gasket damage, or foreign matter on its surface, or forgetting to install spark plug gasket, will cause spark plug hole leakage. During diagnosis, you can turn the engine and carefully observe the spark plug around the starting source, if there is a gasoline smell or the sound of air jetting outward, it means that the spark plug seal is leaking.

At this time, the spark plug should be removed, check whether the spark plug pad is damaged, whether it is clean and reliable, and clean or replace it according to the situation. 5.If the cylinder pressure is too low, remove the spark plug, plug the spark plug hole with your fingers, and then turn the engine, your fingers feel that there is a very sharp air flow rushing outward, and at the same time make a sound of "poof, poof", which means that the cylinder pressure is good; Otherwise, the cylinder pressure is insufficient.

At this time, the cylinder block should be removed, and the inner diameter dial gauge should be used to measure whether the diameter of the cylinder body exceeds the service limit. If it is not exceeded, the piston rings and piston should be replaced; If the service limit is exceeded, the cylinder block should be replaced.

The reasons for the difficulty in starting the electric jet engine are as follows

1. The battery loses power, and its performance is characterized by the starter starting to rotate but the speed is not enough, that is, it is weak, and the starter only clicks and does not turn;

2. The flow of gasoline is blocked, and the performance is characterized by no oil pressure in the engine oil supply pipe. This situation usually occurs in the morning when the temperature is very low, and is caused by long-term dirt in the fuel line. When the temperature is particularly low, the water is mixed with debris, so that the fuel line is blocked, and the result is that it cannot be started;

3. The ignition system is in poor working condition, due to the low intake temperature in cold weather, the atomization of hail oil in the cylinder is not good, if the ignition energy is insufficient, the result will be flooding, that is, too much fuel accumulates in the cylinder, exceeding the fire limit concentration and can not land;

4. The exhaust pipe is frozen, and the appearance is characterized by fog cylinder pressure, normal oil supply and power supply, and no car.

The reasons for the difficulty in starting the EFI engine are as follows: 1. The battery loses power, and its performance is characterized by the fact that the starter starts to rotate but the speed is not enough, that is, it is weak, and the starter only clicks and does not rotate; 2. The flow of gasoline is blocked, and the performance is characterized by no oil pressure in the engine bend and the oil supply pipe. This situation mostly occurs in the morning when the temperature is very low, and is caused by long-term dirty chain contamination of the fuel line.

When the temperature is particularly low, the water is mixed with debris, so that the fuel line is blocked, and the result is that it cannot be started; 3. The ignition system is in poor working condition, due to the low intake temperature in cold weather, the fuel atomization in the cylinder is not good, if the ignition energy is insufficient, the result will be flooding, that is, too much fuel accumulates in the cylinder, exceeding the fire limit concentration and can not land; 4. The exhaust pipe is frozen, and the appearance is characterized by fog cylinder pressure, normal oil supply and power supply, and no car.

The low temperature phase causes the viscosity of the lubricating oil to increase, and the engine starting resistance increases. The low temperature slows down the chemical reaction speed in the battery, reduces the discharge capacity of the battery, and reduces the output current value of the cold start, causing difficulty in starting. Diesel becomes viscous due to cold weather, and the fluidity is poor, resulting in poor injection quality and making it difficult to start the diesel engine.

In order to ensure the normal start of the diesel engine, three basic conditions must be met, the first is that the diesel oil with good atomization can enter the combustion chamber in time. The air in the second combustion chamber should be warm enough for the diesel fuel to ignite and burn on its own. Third, the lubrication system works normally, and when these three conditions are met at the same time, the diesel engine will start smoothly.

Measures to solve the difficulty of starting diesel vehicles, check each pipeline, check whether the joint of each grip source is not tight, and at the same time tighten the leaking part and discharge the air in the pipeline in time. Fill the tank with enough diesel fuel and turn the tank switch on. Remove clogged foreign matter from the oil line and remove the diesel filter for cleaning.

Disassemble the injectors, clean the needle valves, and replace the badly worn parts. If the injector is not atomized well, the injector should be disassembled and cleaned, overhauled and readjusted. Preheat the diesel engine, check whether the diesel model used is in line with the current season, and replace it if it does not.

Photo by Chen Min2) NIO EC6 Xpeng P7 Marvel R VOYAH FREE Audi A4L Model Y @2019