What Causes the Screeching Sound at the Moment of Engine Start?
2 Answers
Engine oil temperature being too low is the reason for the screeching sound at the moment of engine start. Here is the relevant information: Cause: When the engine oil temperature is too low, various components inside the engine lack lubrication, resulting in increased friction between them. Consequently, some abnormal noises may occur, which is a normal phenomenon. Function: Engine oil is referred to as the lifeblood of the engine. Inside the engine, it not only lubricates but also cleans, seals, cushions, prevents rust, and dissipates heat. During engine operation, the oil forms a thin film on the surfaces of various components, preventing direct contact and friction between them.
Last time my car made a screeching noise during startup, the mechanic said it was the starter's one-way clutch slipping. It happens when the starter's small gear can't properly engage with the engine flywheel, causing friction and that grinding sound. This issue mostly occurs in older vehicles and is particularly noticeable during cold starts. Additionally, when the starter's carbon brushes are nearly worn out, they can produce a similar metallic screeching sound. I'd recommend getting your starter checked soon. Putting off repairs might lead to sudden failure to start - I got stranded in a supermarket parking lot last time and had to call a tow truck, which was both costly and inconvenient.
