Why does the car stall when stepping on the accelerator?

[LaJesse]

The reasons why the car stalls when stepping on the accelerator are: 1. Dirty throttle with contaminants; 2. Damaged ignition coil, open or short circuit; 3. Dirty fuel filter; 4. Damaged air flow meter; 5. Fuel pump failure. The function of the accelerator: By controlling the throttle opening of the carburetor to regulate the cylinder filling volume and the metered fuel flow of the fuel regulator, determining the engine output power and generating thrust. Precautions for car starting: 1. Do not release the clutch too quickly, lift it slowly; 2. Step on the accelerator after the engine and drive shaft are connected; 3. Lightly press the accelerator during semi-engagement, then release the clutch; 4. Release the handbrake before starting.

[VanessaLee]

As a veteran taxi driver with 15 years of experience, I dread encountering the situation where the engine stalls when accelerating. This usually indicates the engine isn't 'getting' enough air or fuel. It could be due to carbon buildup jamming the throttle valve - when that thing gets dirty, it's like a person struggling to breathe. A failing fuel pump can also cause this; I once had my car stall midway because the fuel pump's filter screen was clogged tight like a cork. A faulty mass airflow sensor will do the same - it's like the engine's nose, and if the nose is blocked, it naturally suffocates and stalls. If the spark plugs are soaked and can't ignite, stepping on the gas will make the engine quit outright. Don't force it to run - last time my colleague didn't believe it could be that bad and ended up paying more for towing than repairs.

[VonMaverick]

Just experienced this last month with my little Polo—it would shake and stall when refueling. The mechanic diagnosed it with a computer and found the crankshaft position sensor was faulty. This component controls the ignition and fuel injection timing; when it fails, it's like the conductor of a band going missing. Fuel system issues could also be the culprit—clogged fuel injectors can cause fuel to flow out but not in, like a straw blocked by a pearl. Vacuum hose leaks are common too, especially in older cars where rubber hoses crack, causing the engine to ingest excess air and stall. Don’t forget to check the fuel pump inside the tank—it should hum when working; no sound means it needs replacing. Here’s a fun fact: using low-quality gasoline can make the entire fuel system act like it has food poisoning.

[StephanieDella]

The mechanic told me about four common culprits for stalling when pressing the accelerator: First, fuel supply issues caused by a clogged fuel pump or filter leading to insufficient 'blood supply'; Second, ignition system failure due to spark plug flooding or coil leakage; Third, air intake leaks, especially from aging intake manifold gaskets in turbocharged cars; Fourth, electronic system glitches, such as a faulty accelerator pedal sensor. You can check if the air filter box clips are loose and spray cleaner on pipe connections - if the engine RPM changes, it indicates an air leak. Remember, high-pressure fuel pump repairs hurt the wallet the most.