What Causes Engine Misfire to Trigger Fuel Cutoff?

[McBriella]

Reasons for engine misfire triggering fuel cutoff: overheating of the radiator, overheating of the automatic transmission, excessively high engine RPM, etc. Detailed explanations of the reasons are as follows: Overheating of the radiator: Due to prolonged or high-speed operation of the engine, the radiator may overheat, and similarly, the automatic transmission may overheat. These conditions will trigger warning lights and audible alarms. In particularly severe cases, the vehicle's onboard computer will cut off the power supply and stop fuel delivery. If this occurs frequently, it is advisable to check the radiator, transmission fluid, engine oil, etc. Excessively high engine RPM: The tachometer usually marks the engine's dangerous RPM range with a red zone. When the needle enters the red zone, the engine typically stops fuel injection.

[DelEvelyn]

As a seasoned driver with years of experience, I know that engine misfire triggering fuel cutoff is quite common. It means the cylinder fails to ignite, and the computer detects it and automatically stops the fuel supply to prevent damage to the catalyst or engine components. The most common causes include spark plugs that are too old or have too much carbon buildup to ignite, or insufficient fuel pump pressure preventing proper fuel injection. Sensor misjudgments or false fault signals can also make the computer mistakenly assume a misfire. The last time I encountered this issue, it was due to a burnt-out spark plug—the car suddenly shook violently while driving, followed by power hesitation and a dashboard warning light. A trip to the repair shop confirmed it was indeed the problem. After replacing the spark plug, everything returned to normal. I recommend regular maintenance of spark plugs and the fuel system, including periodic cleaning of fuel injectors, to effectively prevent such issues. Otherwise, prolonged neglect could damage more expensive components.

[McLola]

Let me explain this from the perspective of understanding cars. Engine misfire refers to a situation where a cylinder fails to combust properly. The ECU (Engine Control Unit) detects abnormalities through sensor data, such as excessive fluctuations in oxygen sensor readings or unstable RPM, triggering a protection program to cut off the fuel supply circuit. This is mainly to prevent unburned fuel from entering the exhaust system and damaging the catalytic converter, reducing the risk of excessive emissions. Common triggers, apart from spark plug or fuel system issues, may include loose wiring connections, sensor malfunctions, or false alarms due to dirt buildup on the mass airflow sensor. Once, while repairing a friend's car, I found that a poor connection in the ignition coil caused signal interruption. During diagnosis, using an OBD code reader can reveal specific fault codes, making it easy to pinpoint the issue. The key is to troubleshoot promptly and prevent repeated fuel cutoffs from affecting driving safety. It's best to check critical components before long trips to ensure everything is functioning properly.

[SanPhoebe]

I've experienced similar situations while driving. When the engine stalls, the car shakes violently, followed by a sudden power hesitation, which is the computer cutting off fuel supply to prevent further damage. This is mostly due to faults in the ignition system or fuel supply, such as old spark plugs with excessive carbon buildup or a clogged fuel pump causing insufficient fuel supply. Last time I went to the 4S shop for inspection, the technician said it was due to aging wires causing sensor signal interruption and misjudgment. It's not difficult to fix—first check if the spark plugs and fuses are intact, then inspect the cleanliness of the fuel system. Regular maintenance can help avoid such minor issues.