What causes the abnormal sound after the cold car starts?

First, the reason for the abnormal starting noise of cold car is generally that the internal gear of starter loses lubrication, which leads to unsmooth and unsmooth phenomenon, which affects the timely return of gear. That is, when the engine starts, the rotation of the starter drives the flywheel to rotate, thus starting the engine. At this time, the engine speed is driven by the starter, so the engine speed is lower than the starter speed. When the engine is started, manually operate the ignition switch to turn off the power supply and the starter is turned off.

Second, because the inside of the starter is too dirty and the lubricating oil fails, the flywheel engine will force the starter to run at its own speed. Because of the speed difference between the two, the starter will make an audible "ugly" sound at this time.

Third, when the starter and the engine are in a hot state, the noise will end, but there will be noise every time it is started seriously. To eliminate this noise, only the starter can be cleaned, maintained or replaced.