The idle speed of the cold car is unstable and the engine will be automatically turned off

There are several scenarios:

1. The idle switch is not closed.

Diagnosis method: Turn on the air conditioner and turn on the steering wheel when idling The engine speed does not rise, which can prove to be this fault.

Troubleshooting: Adjust, repair, or replace the throttle position sensor.

2. Idle control valve (ISC) failure.

Diagnostic method: Check the actuation sound of the idle control valve, if there is no actuation sound, the idle control valve is faulty.

Troubleshooting: Clean or change the idle control valve, and use a special decoder to set the idle speed basically.

3. Air leakage in the air intake pipeline.

Diagnostic Method: If you hear a snorting sound of a leak in the intake pipe, it is evidence of a leak in the air intake system.

Troubleshooting: Find leaks, reseal or replace phase parts.

4. The injector is dripping or clogged.

Diagnostic method: Use a stethoscope to check whether the injector makes a "click" actuation sound or measure the fuel injection volume of the injector, if the injector does not make a sound or the fuel injection volume exceeds the standard, the injector is faulty.

Troubleshooting: Clean the injectors, check the amount of fuel injected into each injector and confirm that there is no clogging or dripping.

The main cause of unstable and jitter at idling;

1. The most common cause of vehicle shaking is that the throttle is too dirty or the fuel injector has too much carbon.

2. When the carbon deposition inside the engine is too much, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get started, 3. After the car is adsorbed, the gasoline adsorbed on the carbon deposition 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, resulting in idle shaking after cold start. 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.

Severe idle vibration is generally caused by engine cylinder failure, aging or loose foot rubber, carbon deposits, fuel system failure, etc.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the above problems caused by carbon deposits. The fuel quality is not very good or the initial fuel of the new car 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, and the carbon deposition exceeds the standard, which is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

The unstable idle speed and automatic shutdown of the EFI Poussin cold car after starting may be caused by the blockage of the injector, and it is recommended to clean it.

In our 8 degrees, it is not considered a cold rise, and it is basically at 800 rpm. Now it's minus 20 degrees, 1100 to 1200 rpm start, and after stabilization, it will be at 1000 rpm. When the power on self-test is not ignition, the ESP engine battery is on.

Unstable idling can be due to the following reasons:

1. The engine has serious carbon deposits.

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. Excessive fouling of the throttle and inlet tract.

The excessive carbon and dirt deposits in the throttle valve and the surrounding air intake, and the change in the cross-sectional area of the air channel, make the control unit unable to accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal.

3. The spark plug spark caused by individual spark plug failure is too weak.

Spark plugs can also build up carbon, which can be cleaned to restore spark plug activity, but some spark plugs are nearing the end of their useful life and their performance will be reduced. The spark plug spark on the individual cylinder is weak, which will affect the performance of the car, and the spark plug failure will cause the car to have the symptoms of "lack of fire", but the spark plug of the individual cylinder will have idle instability symptoms if there is a slight fault.

4. Fuel pressure failure.

If the oil pressure is too low, the atomization state of the fuel injected from the injector is poor or the fuel injected is linear, and only oil droplets are sprayed in serious cases, and the amount of fuel injected is reduced to make the mixture too thin; The oil pressure is too high, and the actual fuel injection volume increases, making the mixture too concentrated.

5. Failure of various parts.

Leakage of intake manifold or various valves, failure of fuel pressure, low oil pressure, failure of ignition system, etc., can also cause engine idling instability.

The reasons for the sudden stalling of the unstable idle speed are as follows:

1.The circuit is so agitated that the obstacle is due to the low voltage power outage and flameout. At this time, you can mainly check the ignition and starter switches, as well as the fuse box.

A short circuit in a low-voltage line causes a flameout, in which case it is an intermittent flameout. Check the low-voltage wiring of the car.

2.Device failure, this problem is generally the ignition coil, capacitor, electronic ignition module. It starts at the beginning, turns off after a while, and then starts again and turns off again.

3.The oil circuit failed, the gasoline pump was damaged, the oil pipe was ruptured, the carburetor inlet was blocked, and the lead sock tank ran out of oil. But in this case the car can be restarted, but it is difficult. Ignition system, engine overheating and detonation system will turn off if there is a problem.

4. Too much carbon deposition on the throttle valve leads to insufficient idle air intake and flameout. In addition, there are many reasons for idle stalling, such as a stuck engine idle motor, a problem with the camshaft position sensor or crankshaft position sensor, and a fault with the idle stall. The main reason for the manual transmission model is that the engine stalls due to carbon accumulation caused by the use of low-quality fuel, and it may also be caused by a lack of driving skills.

This is due to the fact that in the warm-up condition, the ignition angle is limited (about ATDC20CA), and the torque cannot be quickly corrected in advance through the ignition angle of hail slag, and the throttle opening can only be increased by increasing the throttle opening, but the air model has a delay, and there is no time to compensate, once the speed drops below 600, it is easy to shake or even misfire, resulting in the engine stalling.

If you restart the engine, you will generally exit the warm-up mode by default, and directly start it when you are dismantling the boy, at this time, the ignition angle is about 0ca, which can be corrected in time, and the ignition angle can be delayed if the speed is low, and the ignition angle will be delayed if the speed is high, and the speed fluctuation is controlled to the extent that the human body is imperceptible, and it is normal.

This requires you to check whether the throttle is dirty, and secondly, to check whether the spark plug needs to be replaced. The air filter is dirty and needs to be replaced.

It is estimated that there is a problem with the idle motor or throttle, clean the throttle, and then use the computer to match the idle motor.

In this case, the car should be faulty and you have to take the car to a garage for repair.

Use a car diagnostic instrument to diagnose it, check the fault code, and basically it should be a problem with the throttle.

This is due to damage to the carburetor oil needle, just check and replace it.

It's your oil or your antifreeze that you didn't choose right. Let's go to the store and have it maintained.

I cleaned the engine throttle, and there was carbon deposit.

You don't have to maintain it, you have to clean the throttle, check the spark plugs, etc.

In these cases, the throttle air cleaner needs to be cleaned.

It may be carbon deposits, or oil quality problems, etc.

If the TV throttle is dirty, and the throttle idle motor is broken, it will be the same.

When asked, it is best to go to the 4S shop for maintenance and check what the reason is.

Forget it, it's not interesting to discuss this, let it go. In the dead of night, I always want to find a tranquility, Huifan finds a space to be alone, and then let my thoughts drift with the wind, and escape for a while in the tranquility of cranky thoughts. When the soul can't bear the load of life, it can only send a signal to the sky that it is tired, too tired, and this feeling of tiredness is not something that ordinary people can imagine.

Every day I want to find peace in my soul, however, it is really difficult.

From the day people are born, they are destined to accompany a lifetime of emotions and unsatisfactory life, fate is doomed, if you want to change your fate, you have to contend with all the misfortunes and ups and downs, choose the appropriate escape, that is just useless futility. Escape may sometimes be just a minute, or you can only get a minute of silence, or maybe you suddenly realize in the tranquility that people can't live too tired. I often comfort myself in this way.

There is nothing in the world, and mediocrity disturbs itself. Maybe I'm just a mediocre person. Why look for tranquility in anything?

In fact, I want to hope for peace, in this extraordinary and bad day this year. I reflected and reflected. Most of the time I don't understand what I'm doing.

Kind of life. Kind of always tugging at people's minds on certain days. When it comes to the tranquility of seeking, everyone expects to have this moment.

For me, it may feel a little heavier in moments of solitude, but it's not absolute. Sometimes, although people are in a noisy and noisy environment, but the heart has already flown to the realm of not knowing what kind of, I often smile on my face, and I have seen through all the complicated things in my inner constancy.

People sometimes pretend to be a master of the world, but in fact, it is not the case, and the appearance of all this is also due to countless times of crawling, and then the end of reflection. There is no real excitement of benefits, no real heartfelt reverence for life and nature, no gratitude and appreciation for life and the world, no kind understanding, no kind and susceptible heart, no final awakening, and no natural tranquility and detachment.

In many cases, the motivation to seek tranquility is far greater than the force caused by all external things, and it may also be a process of excellence in the pursuit of tranquility for each individual. Why is that? I asked myself with a smile.

For a person who is truly integrated into life, will sigh at the wonder of the creation of the world. The heartfelt reverence and concern for life and nature is a kind of sincere gratitude and admiration.