What are the reasons why the Qashqai won't start?

[LaDonovan]

There are several reasons why the Nissan Qashqai won't start: 1. Battery depletion: The characteristic symptom is that the starter begins to turn but lacks sufficient speed or power, and eventually only makes a clicking sound without turning. Low temperatures in winter or forgetting to turn off certain electrical devices can prevent the vehicle from starting, especially when used for long periods of short-distance, low-speed driving in winter, causing the battery voltage to drop below the rated value and preventing normal operation. 2. Fuel flow obstruction: The characteristic symptom is a lack of fuel pressure in the engine's fuel supply line. This often occurs on extremely cold mornings due to long-term contamination of the fuel line. At very low temperatures, water and debris can mix and block the fuel line, preventing startup. 3. Poor ignition system performance: In extremely cold weather, the low intake temperature can cause poor fuel atomization in the cylinders. Combined with insufficient ignition energy, this can lead to cylinder flooding, where excessive fuel accumulates in the cylinder, exceeding the ignition concentration limit and preventing the engine from starting. 4. Valve coking: In winter, especially after using unclean gasoline, the non-combustible gum deposits in the gasoline can accumulate near the intake and exhaust valves and the combustion chamber, making it difficult to start the engine on cold mornings or even preventing ignition altogether.