What are the reasons for sluggish acceleration after a cold start?
2 Answers
This situation occurs because the engine has not yet reached its normal operating temperature. At this time, the engine oil is relatively viscous, resulting in greater resistance during engine operation. Additionally, some vehicles' transmissions are equipped with a cold protection system. If the temperature is too low, the system will limit the transmission gear, engine speed, and maximum driving speed. It is recommended not to let the engine run at excessively high speeds immediately after starting. Many car owners have the habit of warming up the engine while stationary in winter, but this method is actually incorrect. When warming up the engine while stationary, the temperature rises slowly. The correct way to warm up the engine is to start driving immediately after starting, as this increases the engine load and allows the engine to warm up quickly. However, avoid pressing the accelerator pedal too hard or unnecessary overtaking during the initial driving period. If you live in an area with very low winter temperatures, it is advisable to use 0W engine oil. This type of oil has better fluidity in low-temperature environments, providing better protection for the engine during cold starts and reducing engine wear after a cold start. During a cold start, engine wear is significant because the oil is at the bottom of the oil pan, and various engine components are in a state of dry friction. In daily vehicle use, it is essential to change the engine oil regularly and replace the oil filter every time the oil is changed.
I believe the sluggish acceleration during cold starts stems from low combustion efficiency, with high-viscosity oil impeding engine rotation; incomplete fuel combustion leads to weak power output, increased fuel consumption, and pollution. Sensor issues, such as delayed oxygen sensor feedback, can disrupt fuel control. The catalytic converter's poor cold performance adds to the obstruction. It's advisable to warm up the engine at idle to raise temperature, use low-viscosity oil, clean the fuel system, and perform regular maintenance to reduce environmental impact and promote energy efficiency.
