What are the reasons for engine acceleration failure?

[StevenRose]

Engine acceleration failure is caused by poor fuel quality. Detailed reasons and solutions for engine acceleration failure are as follows: Detailed reasons: Poor fuel quality; cracked engine intake pipe; incorrect ignition timing; fuel injection system failure; throttle position sensor failure; three-way catalytic converter failure; spark plug failure; slow response of transmission computer. Solutions: Replace the engine intake pipe; adjust the ignition timing; replace the fuel injection system; replace the throttle position sensor; inspect the three-way catalytic converter; use higher-grade fuel; replace the spark plugs; replace the transmission computer.

[StLucy]

I've driven quite a few cars, and the most common cause of engine acceleration issues is fuel supply problems. For example, if the fuel pump fails or the filter is clogged, the car won't get fuel and will just roar without moving. The ignition system is also crucial—worn-out spark plugs that can't ignite properly or faulty ignition coils with unstable current will make acceleration sluggish. If the air filter in the intake system is dirty or there's an air leak, the engine can't get enough air, leading to incomplete combustion and poor performance. Faulty sensors like the throttle position sensor or oxygen sensor can mislead the ECU, causing it to send incorrect commands. A clogged exhaust system, such as a melted catalytic converter, creates excessive backpressure and hampers exhaust flow, reducing power. For safety, if acceleration fails, don't force the car onto highways; pull over to check or call a tow truck to avoid accidents. Regularly replacing air and oil filters can prevent these issues. More complex problems like low compression due to weak cylinder pressure or ECU malfunctions require professional diagnostic tools.

[McQuinn]

As a seasoned mechanic, I've seen many cases like this. When the engine can't accelerate, the causes usually lie within the four major systems: fuel delivery, ignition, intake, and exhaust. Insufficient fuel supply could be due to a worn fuel pump with low pressure or clogged injectors from carbon buildup. Common ignition issues include worn spark plug electrodes with increased gaps or aging ignition coils leaking electricity and failing to spark. Reduced air intake might stem from a clogged air filter blocking airflow or manifold leaks causing a lean fuel mixture. Excessive exhaust backpressure can occur when the catalytic converter or muffler internals break and obstruct gas flow. Electronic control problems are trickier, such as throttle position sensors sending wrong signals or ECU programming errors leading to incorrect adjustments. Poor fuel quality with contaminated gasoline may also clog the fuel system. I recommend using a diagnostic scanner plugged into the OBD port to read trouble codes for quick pinpointing. For prevention, monthly fuel pressure tests and spark plug inspections can avoid roadside breakdowns.

[McJessica]

I often encountered this issue when I first started driving—the engine couldn't accelerate, which was very frustrating. Common faults include clogged fuel lines, abnormal fuel pump operation, or insufficient fuel supply. Electrical issues such as faulty spark plugs or ignition coils can cause misfires and lack of power. A dirty air filter in the intake system restricts airflow, reducing combustion efficiency. Faulty sensors like the mass airflow sensor may report incorrect data, causing the ECU to malfunction. Exhaust blockages, such as a damaged catalytic converter, increase backpressure and hinder exhaust flow. For safety, immediately turn on hazard lights and pull over—don't take risks. Beginners should learn basic maintenance, like regularly replacing air filters, to prevent such issues. Carbon buildup in fuel injectors can also cause this, though the impact is minor, it may lead to acceleration hesitation.