In general, the clicking sound when the valve regulator and fuel injector are operating is normal. If there is an abnormal sound that is obviously higher than this sound, it means there is a problem.
First, the motor makes a clicking sound when running. This sound is usually produced by a mixture of the valve regulator and injector solenoid operating noises, although it sounds relatively regular. , it's still a little scattered, and the sound won't be particularly striking. Although most vehicles today use hydraulic regulators to automatically adjust valve clearances, they still produce a click, and the fuel injector solenoid valve also produces a click when it sucks in and releases. Therefore, these two mixed sounds will be output. when the engine is running, which is normal.
Secondly, if there is a sound greater than or different from this mixed click sound when theengine is running, there is a high probability that there is a problem. In this case you should use. a stethoscope to carefully identify the source of the abnormal sound. If the abnormal sound is dull and increases in frequency as engine speed increases, it is likely due to loose internal engine components. For example, the gap between large and small tiles is too large to produce abnormal sound. there is a clear clicking noise only when accelerating, it is the sound of the piston hitting the cylinder, etc. These are all abnormal noises caused by problems.