What Causes a Car to Suddenly Stall and Fail to Start?

[DiJoseph]

Possible reasons for a car suddenly stalling while driving: ignition system failure, short circuit in low-voltage lines, component failure, insufficient fuel supply, or electrical circuit malfunction. Ignition System Failure: Engine overheating or issues with the anti-knock system can cause stalling. Short Circuit in Low-voltage Lines: A short circuit in low-voltage lines may lead to intermittent stalling. Check the low-voltage lines. Component Failure: This issue typically involves the ignition coil, capacitor, or electronic ignition module. The car may start initially but stall after a while, then restart and stall again. Insufficient Fuel Supply: Remove the air filter and press the accelerator pedal. If gasoline sprays from the carburetor's acceleration nozzle, it indicates the fuel system is functioning normally. Electrical Circuit Malfunction: Pull out the central high-voltage wire and use the starter to crank the engine. If no spark appears at the central high-voltage wire, it indicates a fault in the ignition circuit system.