Why does the Audi A1 shake during cold start?

[SanLincoln]

The reasons for the Audi A1 shaking during cold start include insufficient engine temperature and excessive internal carbon buildup. The specific causes and solutions are as follows: Insufficient engine temperature: When the engine temperature is low, the temperature inside the engine is insufficient, and the fuel and lubricant temperatures are also inadequate, making cold starts difficult. Solution: Keep the engine warm to help it heat up. Excessive internal carbon buildup: Carbon deposits on the engine valves and intake passages can absorb an appropriate amount of fuel, failing to achieve the required power performance, resulting in shaking during cold starts. Solution: Perform a system cleaning.