Why is the abnormal noise and unstable idle speed of Regal engine?

The abnormal idle speed of Regal engine may be caused by the failure of idle valve, carbon deposition in intake system and fuel supply system, and may also be caused by ignition coil and spark plug.

There will be more possibility of abnormal noise in the engine compartment. Most people also judge whether it is abnormal noise in the engine compartment by the sound source, usually the harsh noise of metal or the noise of the wind whistling. 1, use high-power electrical equipment as little as possible, such as air conditioning and refrigeration, high-power audio, external power supply, etc. , will increase the burden on the battery and engine. 2. If the idle speed of the engine is unstable, the idle speed is shaking or the idle speed is too high or too low, please don't drive reluctantly, and check the technical condition of the vehicle in time to avoid the failure of flameout while driving. 3, adjust the idle work, must be in the engine temperature is normal, the valve clearance is appropriate, the ignition system is normal, the pipeline is well sealed, the choke valve is fully open, and the throttle valve can be closed tightly under normal circumstances. When adjusting, first loosen the throttle opening adjustment screw to make the engine reach the lowest stable speed.