What causes an automatic car to suddenly stall at idle?

There are three common reasons why a car suddenly stalls while driving:

1.Faulty circuits.

This possibility is that the power is cut off due to low voltage during driving. 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, capacitive electric, electronic ignition module. It starts at the beginning, turns off after a while, and then starts again and turns off again.

3.Oil circuit failure.

The gasoline pump was damaged, the oil line was ruptured, the carburetor inlet was clogged, and the fuel 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.

According to the gear, the fault of automatic transmission and manual transmission is not the same as the sudden shutdown of the car while driving.

The shifting gears of automatic transmission cars include: P, N, D, R, and L.

P gear: Parking. Use this gear when not in use to keep the wheels mechanically locked to prevent them from slipping.

n-gear: Neutral. Use this gear when temporarily parking, and be sure to apply the brakes to prevent the vehicle from slipping on the slope.

D gear: Forward gear, also known as drive gear. Use this gear when the car is advancing.

R gear: Reverse. Use this gear when the car needs to reverse.

L gear: Low gear. When going downhill, make the car use engine power for braking.

There are several reasons for 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.

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

1.Serious engine carbon deposits: Cars always have the problem of carbon deposits, including cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc.

When the engine has too much carbon deposit, it will affect the ignition energy, air intake efficiency and air-fuel ratio of the car, resulting in the unstable power output of the car, and the phenomenon of idle speed and acceleration jitter appears.

2.Unstable oil pressure: If you have cleaned the engine carbon deposits, cleaned the throttle, replaced the oil gasket and spark plug, etc.

And when idling, you still find that the body shakes, it is recommended that you go to the 4S shop to check whether the oil supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal, or the intake pressure sensor value is wrong, and the work is not good, it will cause the body to shake.

3.Engine cylinder shortage: Engine cylinder deficiency mainly refers to the engine one or more cylinders are not working properly, which is generally manifested as:

The exhaust fumes coming out of the car are obviously intermittent, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noises. This is mostly related to ignition coil failure.

4.Aging of engine parts: Shake in the car is also associated with the aging of the engine feet (also known as claw pads).

The engine foot is actually the shock absorber system of the engine. The engine feet are responsible for absorbing slight vibrations when the engine is running. If there is a problem with the engine base, these vibrations can be transmitted to the steering wheel and cab, causing vibrations at idle.

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.

If the car suddenly stalls during idling, it must be due to the harmony, for example.

There are many reasons for the sudden shutdown of the car when it is idling, and it is necessary to go to the repair shop and use the diagnostic computer to investigate.

Causes of unstable car idling.

1. Air leakage from the intake manifold.

When the air that should not be entered, gasoline vapor, and combustion exhaust gas enter the intake manifold, the mixture is too thick or too thin, causing the car to idle unsteadily.

2. Too much carbon deposition on the throttle.

Excessive carbon deposition in the throttle valve and surrounding air intakes, and changes in the cross-sectional area of the air channel, make it impossible for the control unit to accurately control the amount of air intake at idle, which will also lead to too thick or too thin mixture, resulting in unstable idling of the car.

3. Failure of the actuator of the air intake system.

There are many actuators in the engine intake system, such as throttle motors, idle stepper motors, duty cycle solenoid valves, air flow meters, intake pressure sensors, etc., which cause the car to idle unstable.

4. Fuel system failure.

Faults such as clogged injectors, clogged fuel filters, clogged fuel pump filters, faulty fuel pressure regulators, and clogged return pipes can all lead to incorrect fuel injection, resulting in over-concentrated or over-thin mixtures, resulting in unstable car idling.

5. Ignition system failure.

Faults such as ignition module failure, incorrect spark plug clearance, spark plug electrode ablation or damage, and excessive resistance of the high-voltage line lead to a decrease in ignition spark energy or misfire, resulting in unstable idling of the car.

There are many reasons for the sudden shutdown of the car when it is idling, and it needs to be investigated.

Most of today's car engines are electronically controlled fuel-injected gasoline engines, and there are many reasons for idling and stalling

The first step is to analyze the symptoms of idling out. If the engine will stall as soon as it enters idle operation, we call it "no idling", and the causes of this failure generally are: damage to the engine idle motor or the idle motor's wiring; Leakage of the vacuum tube of the brake vacuum booster; Broken membrane of the brake vacuum booster; air leakage in the intake manifold; There is a problem with the idle control module in the engine electronic control unit (ECU).

If the engine sometimes stalls when idling, and it is normal after restarting, we call it "interstitial idle stalling", this fault is very difficult to investigate, and there are many reasons for it, and various parts or circuits are not completely damaged, and the more headache is that the engine can be restarted after occasionally turning off and returning to normal, so even if the engine is idle and stalled due to the sensor, the engine electronic control unit will think that this phenomenon is not a fault, It is not recorded by the engine ECU and therefore cannot be obtained from the fault diagnosis system of the engine ECU. The reasons for "intermittent idle stalling" generally include: the engine idle motor is stuck; The wire sheath of the idle motor is somewhat worn out; The idle air hole is too dirty; There is a problem with the engine throttle position sensor; There is a problem with the camshaft position sensor or the crankshaft position sensor; The engine speed sensor is faulty or too dirty; There is a problem with the idle speed control program in the engine's electronic control unit, etc., and if there is a problem with the quality of the gasoline, it can also cause this kind of failure.

In general, it is due to the dirty throttle and idle motor that will cause the car to turn off automatically when idling. There is also a spark plug ignition that is not good. If the fault cannot be eliminated after cleaning and replacement.

According to the following reasons for the car to stall at idle, check and eliminate and repair and replace:

1. The reason for the idle switch signal circuit.

2. Idle control valve and its circuit reason.

3. Air flow meter and its circuit reason.

4. Injectors and their circuits.

5. Coolant temperature sensor and its circuit reason.

6. Fuel pump and oil circuit system.

7. Problems with the quality of gasoline can also cause this kind of failure.

In addition to using high-standard and high-quality qualified fuel, thoroughly clean the oil circuit, including fuel injectors, throttles, fuel tanks, etc. It may be that the quality of the oil you add is not up to par, there is too much grease, the oil path is blocked, and the oil supply is not smooth. And for the car to stall at idle, the solution to this problem is very simple:

Just clean the idle motor.

If the idle speed is too low, adjust it, and if it doesn't work, you need to change the idle motor.

Change the gasoline filter. Isn't it just that the fuel injector should be cleaned?

The driving is normal, and the idle speed will be timed to turn off without repair.

The reason for the sudden flameout.

1. Engine stalling is one of the common reasons:

a. Engine stalling is one of the common reasons for land wind stalling, which is manifested as the unstable operation of the engine when idling, and the exhaust pipe makes a purring and purring sound.

Solution: The main cause of the fault of the car stalling in the idle state is due to too much dust in the air, which can be solved by cleaning the idle motor.

b. The engine is shaking, followed by stalling, and the second start will be normal!

Solution: Replace the gasoline filter, clean the throttle, and check the spark plug combustion. Or you can turn the ignition switch to the power-on self-test state first, stay for dozens of seconds, let the oil, oil pump or something run for a while, and then ignite.

2. Troubleshooting method for automatic transmission car shutdown:

Pay attention to the place: for the phenomenon of automatic transmission car stalling, it is mainly caused by the use of inferior fuel ridge.

Practical operation: Hold the steering wheel with your left hand to stabilize the direction because there is no power assist, so you must stabilize it hard, press the brake with your right foot to reduce the speed as much as possible, and then quickly hit the AT gear to N gear, then take the key back one notch, and then re-ignite, and then restore the AT gear to D gear for normal driving.

3. Troubleshooting method for manual transmission car ignition:

Solution: Clean the oil circuit thoroughly, including fuel injectors, throttle valves, fuel tanks, etc. It may be that the quality of the oil you add is not up to standard, there is too much grease, the oil path is blocked, and the oil attack is not smooth.

4. Long-term parking is not used

Land breeze flameout is closely related to long-term parking and non-use, because long-term parking can lead to lubrication or electrical problems.

Solution: A thorough maintenance should be done before re-using Qingpei, replacing the oil, filter, etc., and checking the fuel and circuit as appropriate.

What causes an automatic car to suddenly stall at idle?

Sudden stalling at idle. If the idle time is relatively long, there is a sudden stall, this depends on which model, the current model has this ** model, it has this function, in the case of idle years. In the case of a long time, the computer will control the engine to turn off automatically, this is a normal phenomenon, if the idle time is very short, it will automatically turn off, then this empty situation needs to be checked, there may be a problem with a sensor or a problem with the control computer, and there may be a problem with the gasoline pump or a problem with the line.

It can only be determined after a specific examination.

Summary. Hello, the automatic transmission suddenly turned off, this phenomenon, the common is that the throttle is dirty, clean and match the throttle.

What causes an automatic car to suddenly stall at idle?

Hello, I'm helping you sort out the answers to your questions, please wait a moment Sometimes the engine is turned off when the automatic transmission starts.

Hello, the automatic transmission suddenly turned off, this phenomenon, the common is that the throttle is dirty, clean and match the throttle.

The throttle is dirty, causing the idle speed to be unstable.

Cleaned. The spark plug was also replaced, and there was still a problem.

No gearing is normal, no.

Normal. The 4S store couldn't find the reason either.

There is a shortage of oil in the transmission, or there is a problem with the transmission oil pump.

Just changed the transmission oil.

After-sales is not good?

That's because they don't want to look for it.

Find a transmission to see if it is caused by the transmission.

If I can help you, please give me a thumbs up Thank you!

Yes. It's normal to not find a problem idling.

The reason why the car suddenly stalled while driving:

1. Circuit fault;

2. Flameout caused by short circuit of low-voltage line: intermittent flameout; 3. Failure of training and defense device: it can start at first, turn off after a while, and then start again, and then turn off again;

4. Oil circuit failure; The gasoline pump was damaged, the oil line was ruptured, the carburetor inlet was clogged, and the fuel tank ran out of oil.

5. There is a problem with the ignition system and the explosion-proof system for engine overheating.

When found that after the ignition is turned off, according to the road conditions at the time, if there is no emergency, you can slowly step on the brakes to prevent the tail lights, after the speed is reduced, slowly play the direction, drive to the roadside lane, pay attention, the brakes should be stepped on all the time, the power from small to large, do not step on it and then loosen, and then burn the macro to step on, which will lead to the only remaining vacuum is also consumed, and then step on it can not be stepped on, park the car on the side of the road, turn on the four flashing lights, place the tripod, and hit the ** rescue trailer. Hope!