What Are the Reasons for a Car Not Starting in Winter?

[StJoel]

In winter, if a car fails to start, it can be analyzed from four aspects: spark plugs, oxygen sensors, throttle and intake passages, and fuel injectors: 1. Spark Plugs: During operation, especially in winter, symptoms like reduced power, engine shaking, and difficulty starting may occur. This could be due to carbon deposits on the spark plugs or loose ignition coils, leading to starting difficulties. Simply replacing the spark plugs can resolve this issue. 2. Oxygen Sensor: If the oxygen sensor is faulty, it can cause inaccurate fuel injection, resulting in a suboptimal air-fuel ratio in the engine. A significant deviation from the optimal ratio can make the engine hard to start. 3. Throttle and Intake Passages: Dirty throttle and intake passages can also lead to carbon buildup and blockages. In summer, this might manifest as noticeable shaking at idle, while in winter, it can cause difficulty starting the engine. 4. Fuel Injectors: Carbon deposits clogging the fuel injectors or impurities blocking the fuel pump's filter can both lead to the car not starting or having difficulty starting in winter.