Why does the engine stall when climbing in 1st gear?

[Harriet]

No power. Here is relevant information: 1. Using 1st gear for climbing or ascending steep slopes is common because the lower the gear, the smaller the gear ratio, which means the engine's power is amplified more. 2. Since 1st gear is the most torque-intensive gear, the mechanical stress is greater compared to other gears. Especially when there is insufficient power or excessive power in 1st gear while climbing a steep slope, it can cause damage to the transmission and engine, as well as increased fuel consumption. Climbing in 1st gear can be harmful to the car. Additional information: As long as climbing in 1st gear is not prolonged, it is not a problem for the vehicle. The only possible effects might be increased fuel consumption and higher engine temperature. However, the engine temperature can be regulated by the coolant dissipating the heat. The increased fuel consumption will gradually return to normal once the vehicle is back on level ground.