The car is ignited, sometimes the idle speed is unstable, the body shakes badly, and then what happe

There are many reasons for car jitter, it can be too much carbon accumulation on the throttle, aging engine floor pads, or it can be a lack of cylinders in the engine. The lack of cylinder is caused by a faulty ignition system. The main components of the ignition system include the ignition coil and the spark plug.

Causes of 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 fuel tank must be removed and cleaned and then replaced with 93 or 97 gasoline And it cannot be ruled out whether the oxygen sensor is poisoned (this can only be seen by the on-board IDS) The normal oxygen sensor shows a grayish color after burning If it is very black and there is a thick carbon deposit on it, it is the problem Other things have no effect The ignition point of methanol is lower than that of gasoline It will directly lead to incomplete combustion of the mixer By the way, methanol is toxic! Let's check it out in 4s.

One is to clean the idle eye, and the other is to replace the spark plug. Most of these cases are due to the blockage of the idle eye.

1. Excessive carbon deposition or aging of the engine.

If there is too much carbon inside the engine, the gasoline sprayed at the cold start injection head will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin, making it difficult to start. After the car hits the car, the gasoline adsorbed on the carbon deposit 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 foot is aging.

The engine foot is actually the suspension system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing shaking when idling.

3. The oil pressure is unstable.

If the oil pump supply pressure is not normal, or if the intake pressure sensor is wrong and does not work well, the body will shake. The solution is to check the oil pressure and replace the parts if necessary.

The car has just started cold, the idle speed is unstable, the engine shakes, it may be the engine valve and intake tract carbon deposition caused by the shake, or it may be the water temperature sensor, the air flow device is dirty, the specific analysis of the reason, it is recommended to send it to a professional 4S shop for inspection and maintenance.

Leakage from the intake manifold or various valves.

When the air that should not enter, gasoline vapor, and combustion exhaust gas enter the intake manifold, the mixture is too thick or too thin, and the engine burns abnormally. When the leakage position only affects individual cylinders, the engine will shake more violently, which will have a greater impact on the idle speed of the cold car. Common causes are:

loose intake manifold clamp or cracked hose; The intake manifold gasket is leaking.

Damage to the intake manifold or other parts to grind out of the intake manifold; Injector O-ring leakage; The plug of the vacuum tube falls off and cracks; The crankcase forced ventilation (PCV) valve has a large opening; The activated carbon tank valve is normally open; Exhaust gas recirculation (EGR) valve is not closed tightly, etc.

Engine idling is unstable, which can lead to many reasons, the common ones are as follows: 1. Lack of cylinder, check the spark plug, fuel injector, and cylinder tightness. 2. Idle speed control failure, need to be cleaned. 3. Ignition system failure, spark plug, high voltage line, ignition coil failure.

4. If the electronic control system fails, the water temperature sensor, the oxygen sensor, the air flow sensor, etc., the fault code is retrieved by the diagnostic instrument. 5. Air intake system failure, air leakage, etc. The specific reasons need to be listed one by one.

The main reasons for the shaking of the car engine are as follows:

1. If it is shaking or passing when you are in the car.

After two or three minutes, it was slightly better, or better, that is, the rubber bracket in the "machine grip" that fixed the engine was broken; It needs to be replaced;

3. If it shakes after getting into the car, it will still be after refueling; Key inspections: individual cylinder working status, oil supply, fuel injector, spark plug, high-voltage line, ignition coil, oil pump working condition, timing belt, various conveyor belts related to the engine;

In addition, in terms of maintenance, it is important to check the carbon deposits of the throttle.

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.

Summary. The car starts to idle unstable, the car shakes off and turns off the ignition, which is generally more obvious in the cold start, after the hot car due to the high engine temperature, even if the atomization effect is not good, it will be evaporated by high temperature, so it is not obvious.

Hello, nice to meet you. I'm Xiaomo, an auto repair consultant. With 15 years of experience in automobile maintenance, he is currently working in FAW-Volkswagen, one of the world's top 500 state-owned enterprises, with a senior certificate for automobile maintenance and a certificate for auto beauty technicians, and is familiar with the detailed configuration of major brands of vehicles, and has provided comprehensive automobile repair and maintenance consulting for tens of thousands of customers.

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The car starts to idle unstable, the car shakes off and turns off the ignition in the start, this is generally more obvious in the cold start, after the hot car, due to the high engine temperature, even if the atomization effect is not good, it will be evaporated by the high temperature wild macro, so it is not very obvious that the stool is sold.

It's spring, and the weather in Xinjiang isn't 30 degrees cold.

And the car has always been like this.

It's been two or three days. Have you ever cleaned the car fuel injector in this case, which injection is blocked by the stove, resulting in poor gasoline atomization in the state of just starting the code, which directly affects the normal combustion of the engine;

I took this car and it was just bought.

What people told me was that they didn't know that it was like this, and I thought it was a trivial matter at the time, so I didn't care.

The situation of the car I just bought is caused by the run-in period of the car.

Because the vehicle needs to be driven for a period of time after leaving the factory to run in the interior accessories.

What now? In this case, you need to wait until the run-in period is over.

The run-in period of the new car refers to the period when the new car leaves the factory for the first time to run a certain distance to make the various parts of the engine run in smoothly, and the run-in mileage of the new car is generally 1000 kilometers - 3000 kilometers.

Vehicle Idle Jitter:

1 The most common is that the throttle is dirty or the throttle valve is faulty, which will lead to idle shaking, and the main reason for the dirty throttle valve is that there is carbon deposition at the junction of the shaft brother of the throttle valve plate and the throttle body, resulting in the throttle opening is not accurate enough, so the idle speed will shake. So we can clean the throttle first, if it does not shake after cleaning, it means that the throttle is dirty, if it is still shaking after cleaning, it may be that the throttle assembly is damaged, and the throttle assembly needs to be replaced.

2. The quality of gasoline is not good, resulting in poor atomization effect of the fuel injector, and the mixture is not fully burned in the cylinder, so it will also lead to idle shaking.

3 The spark plug does not ignite, causing one or more cylinders to not work, which will also cause idle jitter. Check the spark plug If there is a crack in the ceramic part of the spark plug, you also need to check whether the fire module of the lower point training hall is normal.

Analysis of the causes of car shake:

1. Suspension system problems.

Body shake is also related to the aging of the suspension system. It is mainly responsible for filtering out the shake of the engine when it is running, and if there is a problem with the suspension, these vibrations will be transmitted directly to the steering wheel and cab, affecting the driving. When the engine is idling, it is easy to cause shaking when the electrical system in the car is turned on.

The engine will increase the load when the electrical appliances are turned on, causing the idle speed to drop, and to compensate for the jitter caused by the idle slip, the engine will automatically increase the speed by partially. So, when the electrical system, especially the air conditioner, is turned on, the engine will often shake. This jitter is likely to be caused by the aging of the shock absorber and needs to be replaced in time.

2. Tire problems.

For tires, the tire must be balanced once when the car is replaced with new tires and new steel rims, otherwise the steering wheel will be prone to shake when the counterweight is uneven. If you find that the tire weight is not equal, you need to add lead to the inside of the rim to average the weight of the tires on both sides. Whether it is a general steel ring or a lightweight aluminum ring, it may deform or crack when subjected to a certain external force.

Deformation of the rim can cause shaking when driving, uneven weight of the rim can also cause shaking when driving, and incorrect angle of the rim can also cause shaking when driving.

3. Throttle problems.

The most common cause of car shake may be a dirty throttle valve and excessive carbon build-up in the fuel injector. After the car travels for a period of kilometers, the throttle valve will be too dirty to cause the throttle to close loosely or the idle motor to stagnate, resulting in the engine idling speed is too high, and the carbon deposits generated by the engine in this process will also cause the vehicle to shake, especially when starting the vehicle, the engine will shake more than normal, and even sometimes there will be a phenomenon that can not be started at one time. Therefore, when the body shakes, the first thing to do is to check the throttle and fuel injectors.

If you find that the throttle valve is too dirty or the fuel injector has too much carbon deposit, you should clean it with fuel injector cleaner or throttle cleaner in time.

4. The oil pressure is unstable.

If you still find that the body shakes after these are finished, it is recommended that you go to the repair shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is not normal, the intake pressure sensor is wrong and improper work will cause the body to shake.

The car will shake, the engine will rattle, and the tachometer will be a little higher – normal means 600 to 900 rpm. If started in such a situation, the engine is prone to carbon build-up (because the engine does not burn sufficiently at low temperatures). You can't change gears when renting a combustion mold to drive, and you should change gears in time when the engine shakes.

Drag will cause the engine to bear excessive pressure, insufficient power section, incomplete gasoline combustion, nozzle carbon deposit, affect the service life of the engine. Chassis protection. The chassis is the part of the car body that is very close to the ground, and it is also the part that is easy to be injured by ground objects when driving.

Therefore, it is necessary to check the chassis frequently to avoid excessive damage to the chassis caused by foreign objects. The oil should be replenished in time. If no visible deterioration of the oil is found during the inspection, it should be ascertained if there is a leak.

If there is, it should be eliminated and replenished with the same level of engine oil in time. After starting, the car trembled and shook violently. The reasons for unstable idling are as follows:

1。Too much carbon deposit. If the engine cylinder has serious carbon deposits, it will cause spark plug blockage and valve blockage, which will directly affect the shaking and shaking of the car when idling.

If the acceleration ability of the car is not as good as before, and the shaking is long-lasting, then you can consider cleaning the engine cylinders; 2.The oil supply system is faulty. Unstable oil pressure can easily cause unstable mixture concentration, which will not only cause shaking and vibration, but also cause unstable idling.

3.The first priority is to consider replacing the gas filter. After all, the filter cartridge may clog after a long time.

If you detect a slowdown in oil pressure that is not passing through the gasoline filter, it could be a problem with the oil pump.