Why does the car shake when starting in first gear?

[FinnMarie]

The reasons why the car shakes when starting in first gear: the temperature is too low, and the car has been parked for a long time. Temperature is too low: Mainly because the temperature is too low, the lubricating oil is in a semi-solidified state and cannot fully perform its lubrication function, so the resistance during the starting process is greater than that at normal temperatures, thus causing the shaking phenomenon. The car has been parked for a long time: The engine oil inside the engine flows back to the oil pan at the lower part of the engine. Therefore, when starting the engine after it has not been used for a long time (such as overnight), the upper part of the engine is actually in a state without oil and lacks lubrication. It takes about 30 seconds after starting for the oil pump to operate and deliver oil to the parts of the engine that need lubrication the most, such as the pistons, connecting rods, and crankshaft.