What Causes a Car to Suddenly Become Difficult to Start?

[McGabriella]

There are several reasons why a car may suddenly become difficult to start: 1. Excessive carbon buildup leading to frequent malfunctions. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start fuel injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes the car difficult to start until the carbon deposits become saturated with gasoline, after which the engine starts more easily. 2. Low engine temperature. When the temperature inside the engine is too low, both the fuel and lubricating oil are not warm enough. Therefore, during a cold start, more fuel should be injected to meet the power requirements. Poor fuel atomization at low temperatures leads to reduced ignition energy, which affects performance and causes the car to shake.