Why does the car stall when braking at a red light?

[RobertAnn]

The reasons why the car stalls when braking at a red light are: 1. Inexperienced driving skills or improper operation; 2. Fuel pump stuck or malfunctioning, causing poor fuel supply; 3. Use of low-quality fuel leading to excessive engine carbon buildup; 4. Faulty spark plugs or ignition coils, resulting in multiple cylinders not firing; 5. Excessive dirt on the idle motor valve core and throttle body. The solutions for a car stalling when braking at a red light are: 1. Quickly break in the car and improve driving skills; 2. Use qualified fuel; 3. Clean the fuel system, injectors, and fuel tank; 4. Clean the throttle body; 5. Clean the idle motor; 6. Replace the engine oil and oil filter.

[OVictoria]

I've noticed many cars stalling when braking at red lights, most commonly in manual transmission models. This is usually caused by improper clutch operation or issues with the engine idle control. When you apply the brakes, the braking system adds extra load to the engine. If the clutch isn't fully released or is pressed too deeply, the engine RPM may drop too quickly, leading to stalling. Automatic transmission vehicles also face similar risks, such as excessive carbon buildup in the throttle body, faulty mass airflow sensors, or aging fuel pumps, which can make the engine unstable under low load conditions. I've handled similar cases before, and cleaning the throttle body or resetting the ECU can often improve the situation. If stalling occurs frequently, it's advisable to have a professional check the spark plugs and fuel system to ensure idle speed is within the normal range and to prevent safety hazards.

[AlyssaMarie]

I experienced this several times when driving my old manual transmission car. The engine would stall when I braked at a red light, which was quite embarrassing. Later, I realized it might be caused by worn clutch plates or loose idle speed screws. Increased braking load combined with low engine RPM makes it prone to stalling. After I learned to adjust the throttle position sensor myself, the situation improved significantly. A friend with an automatic transmission said similar issues could stem from brake linkage failures, such as insufficient vacuum boost. Pro tip: Don't rush to restart after stalling - check if the engine light is on first, otherwise restart slowly and move to the roadside. Regularly changing the air filter can also reduce this risk.

[StPatrick]

It's quite annoying when the car stalls after braking at a red light, mainly due to engine load imbalance. In manual transmissions, releasing the clutch too quickly or excessive braking can cause a sudden drop in RPM. For automatic transmissions, this often occurs due to a dirty throttle body or sensor failure. It's recommended to pull over and restart the engine immediately to avoid accidents. Long-term neglect can lead to increased fuel consumption and even damage to the transmission.