Why Does the Engine Make Abnormal Noises During Cold Starts?

[LeCarlos]

Here is the relevant information about abnormal noises during cold starts: 1. Reasons for abnormal noises during cold starts: Generally, it is caused by the lack of lubrication inside the starter gears, leading to stiffness or jamming, which affects the timely return of the gears. That is, when starting the engine, the starter rotates to drive the flywheel, thereby 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 starts and its speed exceeds the starter speed, the ignition switch is manually turned off, and the starter shuts down. 2. Lubrication failure: Due to excessive dirt inside the starter, the lubrication fails. The engine forces the starter to operate at its own speed through the flywheel. Since there is a speed difference between the two, this results in the "grinding" noise heard from the starter.