Reasons for Difficult Engine Starting

[LeDonovan]

Here are the specific reasons why a car may have difficulty starting: 1. Excessive carbon deposits leading to frequent malfunctions. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start fuel injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making the engine hard to start. Only when the carbon deposits become saturated with gasoline does the engine start more easily. After starting, the gasoline adsorbed on the carbon deposits is then sucked into the combustion chamber by the engine's vacuum, making the air-fuel mixture too rich. The constantly fluctuating air-fuel mixture causes the engine to idle roughly after a cold start. 2. Low engine temperature. When the temperature inside the engine is insufficient, the fuel and lubricating oil cannot reach the required temperature. Therefore, during cold starts, more fuel should be injected to meet performance requirements. Poor fuel atomization at low temperatures leads to reduced ignition energy, affecting performance and causing the car to shake. Aging ignition coils, aging spark plug high-voltage wires, or electrical leakage can also reduce ignition energy.