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Why does a car suddenly stall while running and then fail to start?

1 Answers

RicardoLee

07/29/25 4:10pm

There are several main reasons why a car fails to start after stalling: ignition system, fuel supply system, intake and exhaust system, electrical system, and mechanical system failures. 1. Fuel supply system: Check for a damaged fuel pump, ruptured fuel lines, clogged carburetor fuel inlet, or an empty fuel tank. In such cases, the car can actually start. Remove the air filter, press the accelerator pedal, and if gasoline sprays from the carburetor's acceleration nozzle, it indicates the fuel system is functioning normally. 2. Electrical system: While driving, issues like low-voltage power failure or engine overheating causing anti-knock system failure can lead to stalling. Check the ignition and starter switch. Remove the central high-voltage wire and start the engine with the starter. If there's no spark from the central high-voltage wire, it indicates an electrical system problem. 3. Low-voltage circuit short causing stalling: This results in intermittent stalling. Inspect the low-voltage circuits. 4. Component failure: This usually involves the ignition coil, capacitor, or electronic ignition module. The car may start initially, stall after a while, restart, and then stall again. 5. Check for carbon buildup: If the car has run about 20,000 KM, focus on inspecting and cleaning the throttle body. 6. Test and inspect the starter, fuel pump, sensors, and other components related to the starting and fuel supply systems.

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