What are the symptoms of difficult cold starts in cars?

[TaylorDella]

Symptoms of difficult cold starts in cars: 1. Faulty fuel pressure regulator; 2. Coolant temperature too low; 3. Excessive carbon buildup and fuel injector malfunction. Solutions: 1. Check fuel pressure and determine the fault location by inspecting the fuel pressure regulator; 2. Replace antifreeze in a timely manner according to climate changes; 3. The issue may disappear after the engine warms up. When there is excessive carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Only when the carbon deposits become saturated with gasoline does the car start easily.