Hyundai Accent idle unstable, throttle valve also changed, idle motor also changed, still unstable,

1. Diagnosis method for idle switch not closing: turn on the air conditioner when idling, and turn on the steering wheel 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) fault diagnosis 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. Diagnosis method of air leakage in air inlet pipeline:

If you hear a snort of a leak in the intake pipe, it is a sign that the intake system is leaking. 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.

Wuling Motors idling unstable throttle valve idling specific solutions:

1. After the "new idle motor", use the computer detector to clear the data of the driving computer and check whether it has been restored;

2. If the data has been cleared or restored. Please clean the [throttle body assembly] with a cleaning agent.

3. If it is cleaned, there is no effect. Replace the throttle body assembly (the idle motor is included in the assembly). Please use regular accessories. After the assembly is replaced, clear and restore the data.

There are many reasons for the unstable idle speed of the engine, and there are generally the following reasons: the throttle is too dirty, which leads to the excessive opening of the throttle, which leads to the unstable idle speed of the vehicle when it is just taken a taxi. The problem of spark plug or ignition coil ignition problem, this problem will generally lack the problem of cylinder, which is the unstable idle speed.

Moreover, the power is insufficient during driving, the problem of the intake pipeline, and there is a leakage, so that the power is generally insufficient, and the problem of gasoline pressure leakage generally occurs in the intake pipe and exhaust pipe. Generally, the oil pump does not work, and the fuel injector is blocked, resulting in poor fuel injection.

1. Fault judgment:

It is usually manifested as: the engine is found to work abnormally or the power is insufficient, the engine works unevenly at high, medium and low speeds, and the rhythmic vibrating muffler discharges black smoke and discharges guns. The lack of cylinder in the engine can lead to large fuel consumption, black smoke, weakness, horsepower decline, the vehicle cannot increase speed, serious shaking, and increased driving noise.

And it is very bad for driving safety. Especially on the road section that needs to be sloped, the engine load of the vehicle with a lack of cylinder increases, the body shake is more obvious, and it is very easy to have an instantaneous dead fire.

Second, the lack of cylinder operation of the engine will bring great harm

1.The speed and power of the engine decreased.

2.Increased fuel consumption and emissions of pollution.

3.Aggravate the wear of running parts and shorten the service life of lubricating oil.

Third, the maintenance method: first check the circuit fault, and then check the valve tightness (cylinder compression ratio), if there is no problem with the above inspection, it is more troublesome, belongs to mechanical aging or damage, need to be overhauled.

Check the ignition coil and spark plug.

tyhgh about the problem of unstable idle speed of the new car you consulted, because you have not seen the current car, the main cause of the failure should be caused by carbon deposition in the throttle, and there is carbon deposition inside the air intake, which adsorbs some gasoline when the car is cool, and the mixture will be too thin when the engine is idling, which will cause the idle speed of the cool car to be unstable. Therefore, you should check whether the carbon deposition in front of the mold of the throttle and the inlet part of Qiaomayun is too much, if it is too much, it will cause the cross-sectional area of the air passage to change, so that the control unit can not accurately control the idle air intake, resulting in the mixture is too thin, so that the combustion is abnormal. At the same time, you should also pay attention to whether the canister is malfunctioning.

You can also find time to run at high speeds, which will help to reduce the formation of carbon deposits.

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Normal, there is an idle valve on the engine is controlled by the engine computer, it will automatically adjust the idle speed according to the load of the engine, to ensure that it will not turn off, you suddenly stuffy the clutch idle speed increases, it means that the idle speed has been increased when the load is loaded, caused by sudden load reduction.

Normal can't be normal anymore, and that's the case with all manual transmission cars. The higher the roaring speed, the better the engine condition, and the car will be used for a long time, and the working condition will drop, and the speed will decrease.

1.As long as it is well controlled, relying on idle speed is not a problem.

2.Idle speed is automatically controlled. Basically, the small amplitude can be automatically controlled by the driving computer (as you will find out later).

3.When relying on idle driving, the driving computer should be controlled to prevent him from turning off, there will be a small amount of "refueling", at this time when you are bored clutch, the resistance of the engine suddenly disappears, which is reflected in the fact that the speed rises sharply when you do not refuel, and then falls.