What are the reasons for no response when starting a Focus?

[VonAnderson]

Reasons for no response when starting a Focus: frozen exhaust pipe, valve coking, poor ignition system performance, blocked fuel flow, and battery depletion. Frozen exhaust pipe: The external characteristic is that the car has normal fuel and power supply but fails to start. This situation is prone to occur in vehicles with very low usage frequency. Solution: Place the car in a warm environment, and it will start naturally once the ice melts. Valve coking: When using the car in winter, especially after using unclean gasoline, the gum in the gasoline that cannot be burned will accumulate near the intake and exhaust valves and the combustion chamber, causing difficulty in starting on cold mornings, or even failure to start. Emergency method: Drip some engine oil into the combustion chamber to start the car. Poor ignition system performance: In cold weather, due to low intake air temperature, the fuel does not atomize well in the cylinder. If combined with insufficient ignition energy, the result will be cylinder flooding, where too much fuel accumulates in the cylinder, exceeding the ignition limit concentration and preventing the car from starting. Emergency method: Unscrew the spark plug and wipe off the oil between the electrodes. After reinstalling, the car can start. A thorough solution is to check the ignition system and eliminate the causes of low ignition energy, such as spark plug electrode gap, ignition coil energy, and high-voltage line condition. Blocked fuel flow: The characteristic is no oil pressure in the engine fuel supply pipe. This situation often occurs on extremely cold mornings and is caused by long-term dirt in the fuel pipeline. When the temperature is extremely low, water and debris mix and block the fuel pipeline, resulting in failure to start. Emergency method: Place the car in a warm environment, and it will start after a while, or thoroughly clean the fuel pipeline. Battery depletion: The characteristic is that the starter begins to turn but lacks sufficient speed, and later the starter only makes noise without turning. Low winter temperatures and forgetting to turn off certain electrical devices can cause the car to fail to start, especially when used for long-term short-distance low-speed driving in winter, resulting in battery voltage below the rated value and failure to start or operate normally. If it starts temporarily, the battery must be recharged at a service station afterward.