What faults will occur if the car's air flow meter is broken

[McZane]

Air flow meter failure can cause the engine to surge and intermittently stall. More extended information is as follows: Overview: Air flow meter failure leads to engine surging and intermittent stalling. In this situation, the vehicle's idle is normal, acceleration in place is normal, and driving at usual speeds is also normal. However, the above fault phenomena may only occur when the speed exceeds 120km/h. This fault may be caused by inaccurate signal output from the air flow meter at high speeds. Others: Air flow meter failure can cause the engine to emit black smoke and have high fuel consumption. Black smoke and high fuel consumption indicate that the injector's fuel injection volume is excessive and the engine's air-fuel mixture ratio is too rich. Since the air flow meter affects fuel injection, it can also lead to this fault. Under stable engine air intake conditions (no air leakage), the signal fluctuation of the air flow meter should be stable. If the signal frequency output by the flow meter is incorrect, for example, it should be 30-40Hz at idle but changes to 500Hz, then the corresponding fuel injection volume at this time would be 8ms (normally 2-3ms at idle), which means there is too much fuel in the air-fuel mixture.

[DeGianna]

I've been driving for twenty years, and if the mass air flow sensor goes bad, the car immediately starts showing all sorts of problems. As soon as you start it, the engine shakes violently, making the whole car body tremble. At idle, the RPM fluctuates up and down like it's dancing, which feels very unstable when driving. When accelerating, the throttle response is extremely slow—you can floor it, but the speed still won't pick up. On the highway, you can't even overtake properly, which is quite dangerous. Fuel consumption also skyrockets. Normally, it’s around 10 liters per 100 kilometers, but it can jump to 15 or 16, costing a lot more in fuel expenses each month. If the check engine light comes on, that’s a warning. If you don’t fix it, it could damage the catalytic converter, leading to even higher repair costs. My advice is to get it checked as soon as you notice an issue—fixing small problems early saves money and hassle.

[Allen]

I've been into cars for many years. When the mass air flow sensor fails, the engine's air-fuel mixture ratio gets messed up. During ignition, the engine shakes violently with unstable idle, and acceleration feels weak as if the power is being choked. Fuel consumption increases noticeably, and the exhaust may turn black or emit strange odors—not only polluting the environment but also risking a failed emissions test during annual inspection. Ignoring it can lead to further damage to spark plugs or oxygen sensors, costing more in replacements. Modern cars rely heavily on sensor monitoring, so regular maintenance checks are crucial—don’t delay fixing any issues.

[LeAugust]

In my daily car usage, I found that the mass airflow sensor is faulty, causing a significant increase in fuel consumption. Previously, a full tank could last for 500 kilometers, but now it only reaches 400. The end-of-month bill is painfully higher. The engine often fails to start or stalls when igniting, and there's noticeable jerking at low speeds with sluggish acceleration—the car feels powerless. If repairs are delayed too long, the exhaust system's catalytic converter may get damaged, and replacing it could cost thousands. I recommend paying attention to symptoms like dashboard warning lights or sudden power loss, and promptly visiting a professional repair shop to avoid costly major repairs.

[SiennaLynn]

Safety comes first when driving. If the mass airflow sensor fails, it can be dangerous when acceleration doesn't respond at critical moments. Once on the highway when I tried to change lanes to overtake, the car didn't respond after stepping on the gas, almost causing a rear-end collision. Engine shaking leads to unstable driving and potential sudden stalling, making it difficult to start at traffic lights or climb slopes. Fuel consumption surges and easily pollutes the air, with emission issues being harmful to health. I remind everyone to perform regular maintenance checks to prevent minor faults from turning into major disasters.

[VonXavier]

I suspect the mass airflow sensor in my new car is faulty, which could throw the entire electronic system into chaos. After starting the engine, error codes appear, the check engine light comes on, acceleration becomes sluggish and weak, and fuel consumption doubles. The system inaccurately monitors air intake, leading to incorrect fuel mixture ratios and affecting driving smoothness. Modern smart cars rely on networked sensors, so a faulty one might cause issues with automatic gear shifting or assistive functions. The repair is relatively straightforward and can be diagnosed with a scan tool, but don't delay to avoid secondary damage to components like the catalytic converter.