【Owner's home car knowledge】If the idle speed value of the automobile engine is lower than or exceeds the specified range, there will be phenomenons such as stage flameout and unstable speed.
1. What should I do if the idle speed is unstable?
Unstable idling speed is manifested as: when idling, the engine shakes and the speed is uneven. The reasons are: the idle air volume hole is blocked, the idle device is not working well, the spark plug of some cylinders is too weak, the seal of some valves is not tight, the intake manifold leaks, the ignition time is too early or too late, and the idle speed is not adjusted properly. When the idle speed of the engine is unstable, the idle speed should be adjusted first. If the fault still cannot be eliminated after adjusting the idle speed, check whether the idle speed measuring hole and the idle air measuring hole are blocked. If the measuring hole is blocked, clean it with gasoline or acetone and blow it through with compressed air; If the measuring hole is not blocked, the engine speed should be stabilized at a certain speed, and check whether there is air leakage in the intake manifold or the middle and lower gaskets of the carburetor. The method of reducing the gasket is eliminated. If the idling speed is unstable and the engine pow
【Owner's home car knowledge】If the idle speed value of the automobile engine is lower than or exceeds the specified range, there will be phenomenons such as stage flameout and unstable speed.
1. What should I do if the idle speed is unstable?
Unstable idling speed is manifested as: when idling, the engine shakes and the speed is uneven. The reasons are: the idle air volume hole is blocked, the idle device is not working well, the spark plug of some cylinders is too weak, the seal of some valves is not tight, the intake manifold leaks, the ignition time is too early or too late, and the idle speed is not adjusted properly. When the idle speed of the engine is unstable, the idle speed should be adjusted first. If the fault still cannot be eliminated after adjusting the idle speed, check whether the idle speed measuring hole and the idle air measuring hole are blocked. If the measuring hole is blocked, clean it with gasoline or acetone and blow it through with compressed air; If the measuring hole is not blocked, the engine speed should be stabilized at a certain speed, and check whether there is air leakage in the intake manifold or the middle and lower gaskets of the carburetor. The method of reducing the gasket is eliminated. If the idling speed is unstable and the engine power drops, you should further check the working condition of the spark plug, the sealing performance of the valve and whether the ignition time is correct, and repair and adjust it if necessary.
2. How to judge poor idle speed?
A working engine should be able to run evenly within the speed range of 300-500r/min. If the minimum stable engine speed exceeds this speed range, or the engine stalls and the speed is unstable within this speed range, it means no idle speed or poor idle speed. When the idling speed is poor, it can be divided into idling flameout, unstable idling speed and high idling speed according to its fault characteristics. If the engine runs well from low speed to high speed after the engine is started, but the engine is turned off as soon as the accelerator pedal is released, or the engine runs unstable first and then turns off, it is an idle stall failure. If the engine does not run smoothly at idle speed, and the exhaust pipe makes a "sudden, sudden" sound, it is generally an unstable idle speed failure. If the minimum stable engine speed is higher than the specified range, and the speed cannot be reduced, then the idle speed is too high or there is no idle speed failure.
3. How to adjust the idle speed?
Adjusting the idling speed must be carried out under normal conditions such as normal engine temperature, proper valve clearance, normal ignition system, good sealing of each pipe, full opening of the choke valve, and tight closing of the throttle valve. When adjusting, first unscrew the throttle opening adjustment screw to make the engine reach the lowest stable speed. Then screw in the idle speed adjustment screw with a screwdriver. When the engine is about to turn off, slowly unscrew the idle speed adjustment screw to make the engine run stably and reach high speed. Then unscrew the throttle opening adjustment screw so that the engine speed can be reduced to the minimum. Then adjust the idle speed adjustment screw to increase the engine speed. This is repeated until the throttle opening is the smallest and the engine is running at the lowest stable speed. Finally, increase the speed and close the throttle suddenly, so that the engine is still running without stalling.
4. What should I do if the engine is turned off at idle speed?
When the engine is idling and stalled, the idle speed should be adjusted according to the actual situation. After adjustment, if the fault disappears, it means that the idle speed screw is not adjusted properly. After adjustment, if the fault persists, open the throttle valve a little wider to keep the engine running. Use cotton yarn or paper strips to check whether there is air leakage at the carburetor and the gasket of the intake manifold. If there is no air leakage, remove it. Check the idle speed measuring hole, and blow through the idle speed oil passage at the same time, and then reinstall the test. If the fault disappears at this time, it means that the idle speed measuring hole and the idle speed oil passage are blocked. For carburetors equipped with an idle stop valve, check whether the electromagnetic coil circuit of the idle stop valve is normal. If the idle fuel saving hole is blocked due to abnormal electromagnetic coil circuit, the idle stop valve should be repaired.
5. What should I do if the idle speed is too high?
When the engine idle speed is too high, the engine should be started first, and then the throttle arm should be controlled by hand to close the throttle. If the idle speed is normal at this time, the throttle spring is too soft and should be replaced. If it is invalid to close the throttle by hand, check whether the throttle shaft is loose or whether the throttle is closed tightly. If the throttle is not closed tightly or the throttle shaft is loose, it should be repaired; if the throttle is normal, check Check whether there is a slight air leakage under the throttle valve. If there is, the air leakage should be eliminated. If there is no air leakage, the idle speed should be further adjusted until the idle speed is suitable.
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