The Accord has a low idle speed, and the jitter is obviously a fault

The cause of the car idle jitter may be: spark plug or ignition coil failure;Incorrect valve timing;Cylinder compression is uneven;

The valve seal is not tight, and there is air leakage;Poor fuel pressure;Fuel injector plugging leakage;Leakage between the cooling system and the cylinder;Air flow.

Sensor failure.

Classification of unstable idling.

How to observe unstable idling.

Observe the degree of shaking of the engine block, you can also ** the degree of shaking of the oil dipstick, and the smooth dipstick handle is very clear and shaking.

The dipstick handle looks double;Observed from the engine tachometer or reading data block, the rpm is jitter centered on the idle expectation value, or.

Sharp shaking on the expected side, the expected idle speed in the program includes the standard idle value, load (light on, automatic transmission.

Hanging gear, etc.), idle value, air conditioning idle value, warm car idle value;Start the engine on the spot and feel the body violently while sitting in the seat. Dithering.

Classified according to the law of appearance.

Cold car (coolant temperature below 50) rhythmically unstable;Hot cars (coolant temperatures above 50) are rhythmically unstable.

Irregular, violent shaking.

One, two. 3. Classification according to the degree of jitter.

Normal, with an expected idle speed of 10r min jitter;Generally unstable, with an expected idle speed of 20r min jitter;Seriously not.

Steady, exceeding the expected idle speed by 20r min jitter;Shake violently on the side of the idle expectation.

Categorized by reason association.

The direct cause refers to the dirty, worn, incorrect installation of mechanical parts, etc., which leads to the change of the power of individual cylinders, resulting in each ...

The power of the cylinder is unbalanced, resulting in unstable engine idlingIndirect causes refer to the abnormal electronic control system of the engine, resulting in mixing.

Poor combustion of the combined gas makes it difficult to balance the power of each cylinder, resulting in unstable engine idling.

Classified by faulty system.

Air intake system;②

Ignition system;Motor.

Idling for two to three seconds and shaking once.

Go decode and see.

Eighty percent unstable idle speed is a matter of the throttle valve body.

But you're only running 30,000.

It doesn't have to be dirty. Take a look at the idle motor.

The spark plugs of the Accord VIII are all white gold.

High-voltage lines. You don't even need to check.

Caused by bad combustion, the parts failure repair shop has confirmed for you, now you should check from the soft fault oil circuit, the cleaning oil circuit will most likely return to normal idling, in fact, the low idle speed is caused by bad combustion, and the bad combustion is caused by the dirty oil circuit. You can take a look at cleaning the oil circuit with something like Siyoupu fuel cleaner, and generally this kind of problem will be solved after two tanks of oil.

Please clean the throttle first (do idle learning immediately after cleaning - this step is very important!). Check whether the spark plug and high-voltage coil are normal Check whether the engine pad is in good condition, after completing the above maintenance, install an idle stabilizer to increase the idle speed to more than 800, and the jitter can be basically eliminated.

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When the Accord is idling, the air-conditioned car shakes, and I personally think that it may be the lack of power caused by too much carbon deposition in the car's engine, and it is recommended to check whether the spark plug of the car needs to be replaced and whether the throttle valve needs to be cleaned.

Hello, there is an idle vacuum tube between the engine and the air conditioner, the idle speed of the air conditioner engine will automatically rise about 200 revolutions, you turn on the air conditioner to see if the idle speed is automatically raised, if not, it is possible that the vacuum tube is broken.

If you don't shake when you don't turn on the air conditioner, it may be that the speed of the air conditioner is too low, and you can increase the throttle.

The air conditioner is turned on, increasing the load on the engine. Go and turn down the idle speed.

Go to the repair shop and adjust the idle speed.

Analysis of the causes of car shake:

1. Cold start jitter.

First of all, starting from the cold start, the main reason for the cold start body shaking is that the fuel combustion is insufficient, resulting in insufficient power of the car. The ignition energy is low, and when starting, especially when the temperature of the fuel and lubricating oil is low, more oil is required to meet the power. Over time, the pole gap of the spark plug gradually increases, resulting in a decrease in ignition energy and poor fuel atomization, which leads to the shaking of the body.

In addition, the ignition energy can also be reduced due to the aging of the ignition coil, the aging of the high-voltage wire of the spark plug, or the leakage of electricity.

2. 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.

3. 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.

4. 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.

5. 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 first cause of idle jitter is serious carbon deposition in the engine, and excessive carbon deposition inside the engine causes the combustible mixture to be dilute and thick, and then cause idle jitter after cold start. The solution is to clean the carbon deposits of the oil circuit, focusing on checking whether the idle motor has too much carbon deposits and cleaning it thoroughly!

The second reason for idle jitter is the ignition system problem, the working condition of the spark plug, high-voltage wire and ignition coil is unstable, the ignition system works poorly, and the spark plug flashing condition is not good, which will lead to the idle jitter of the car; The solution is to replace the spark plug (not to clean it).

The third reason for idle shake is the unstable oil pressure, if the engine and throttle carbon deposits, oil pads and spark plugs have been replaced, and the idle speed is still shaking, then it is necessary to consider whether the fuel supply pressure device, oil relief device and intake pressure sensor are normal, and the abnormal oil supply pressure of the oil pump or the wrong value of the intake pressure sensor will cause idle jitter; Be sure to go to a 4S shop to check the oil pressure and replace parts if necessary.

The fourth reason for idle jitter is the aging of engine parts, the aging of the engine foot (also known as the claw pad) will also cause idle jitter, the engine foot is the shock absorption system of the engine, it can absorb the subtle shake of the engine when it is running, if there is a problem with the engine foot, the slight vibration of the engine will be transmitted to the cab, which is manifested as idle jitter; The solution is to replace it!

Idle jitter, the common fault phenomenon is that the throttle valve is too dirty. Causing the idle valve to get stuck, it is necessary to clean the idle valve at this time. On the other hand, it is due to the lack of fuel or ignition energy.

For example, there is less fuel injection or the ignition energy is too weak. The last one is that there is wear and tear on the machine, resulting in too large a fitting gap and air leakage.

There are many factors that affect the idle speed of the vehicle, such as dirty throttle valves, dirty fuel injection heads, excessive carbon deposition in combustion, as well as malfunction of oxygen sensors, fire in spark plugs, uneven cylinder pressure, and poor valve sealing. Solving such problems should be dealt with from easy to difficult. For example, the throttle, injector head and combustion chamber are cleaned first, and then the spark plugs are checked and the claw pads are checked.

Then use the computer to measure the relevant data. In this way, the basic influencing factors of the vehicle are eliminated, and most of the vehicle shake problems will be solved.

Hello, engine shake reason:

First, the engine lacks cylinders.

Engine cylinder lack mainly refers to the engine has one or more cylinders are not working normally, which is generally manifested as: the exhaust gas flow of the car has obvious intermittent gas, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by a sudden sound. This is mostly related to ignition coil failure.

Dirty throttle valves, poor ignition coil contact, large spark plugs or rotten spark plugs, and rotten idle motors will cause idle shaking.

The most common cause of engine idle shake is a dirty throttle valve or excessive carbon build-up on the fuel injector. In addition, ignition system faults, such as spark plugs, high-voltage wires, and ignition coils, can also be caused by poor operating conditions. In addition, if the oil pump supply pressure is not normal, or if the intake pressure sensor is wrong and not working properly, it can also cause the body to shake.

If the car is shaking at idle, you need to check whether the lower throttle is too dirty, as well as the gap of the spark plug. air cleaners, etc. If there is a problem, replace it directly. The throttle valve is too dirty and can be cleaned.

Idle jitter. Check to see if the ECU is faulty.

Then check the spark plug, check the cylinder pressure, check the cylinder line.

1. Excessive carbon deposition in the automobile engine, mainly in the throttle, fuel injector, spark plug and piston part of the carbon deposition, the accumulation of carbon deposition causes the absorption of combustion heat, and in more serious cases, it will deflagrate and detonate.

2. After the ignition system of the car is faulty, the problem is usually that the spark plug has too much carbon and the ignition voltage is insufficient, which will lead to the blindness of the flashover, and even lead to the lack of fire in a single or multiple cylinders, and it is necessary to check the spark plug and high-voltage wire.

3. The fuel pressure of the car is unstable, and the fuel system has gasoline tanks, gasoline filters, gasoline pumps, oil-gas separators, oil pipes and fuel gauges, etc., once these devices are blocked or leaked in a certain link, the engine power can not last, and there will be shaking.

4. If the vehicle engine exceeds its service life, insufficient engine cylinder pressure will also lead to failure, and the engine power will drop seriously and there will be shaking. As a car owner, the vehicle is regularly inspected and maintained to extend the use time of the vehicle.

5. Idle shaking, oil will not shake, because of clutch wear, at the same time, you will feel that the car is more meat than before, in this case you need to replace the clutch three-piece set.

When the Accord drives an air-conditioned car and shakes very much, you need to find out the reason in time, which can be checked from the following aspects:

1. Check the refrigerant pressure of the air conditioner, if the refrigerant pressure is too high, it may cause the engine to idle and not move.

2. If the engine is caused by excessive carbon deposits, check and clean the oil circuit and fuel injector, throttle, idle motor and air intake.

3. Check whether the initial oil pressure is too low, due to the long parking time, the oil pressure of the fuel system is too low or the pressure of the oil pressure control valve is poor, and a good standard oil pressure cannot be established in an instant, which is easy to cause insufficient fuel injection for cold start and form poor starting.

4. Check whether the air filter element is too dirty and affects the quality of the inlet air, which is caused by insufficient at best when starting.

5. Check whether the idle solenoid valve is stuck due to excessive carbon deposits, resulting in the idle shaking of the air conditioner.

The solutions to turning on the air conditioner shaking are:

1. Clean the blower foreign body, if there is no foreign body, the blower needs to be replaced.

2. Start the cooling fan, if the body is shaking, replace the cooling fan.

3. Use the fuel pressure gauge to detect the fuel pressure, if it is too low, replace the fuel pump.

4. For places with too much carbon deposit, you can use cleaning agent to clean.