What causes a car to fail to accelerate?

2 Answers
DiBentley
07/30/25 12:54am
Reasons why a car cannot accelerate: 1. Fuel supply system failure: The primary source of acceleration power in a car is the engine, which operates by burning fuel. Therefore, if there is an issue with the fuel supply system, the car's speed may not increase as expected during rapid acceleration. 2. Failure to regulate fuel pressure, fuel injection volume, or ignition timing as required: During rapid acceleration, fuel pressure, fuel injection volume, and ignition timing are critical factors. If these three elements do not meet specifications, it can prevent the car from accelerating properly. 3. Problems with spark plugs or high-voltage wires: Spark plugs and high-voltage wires are essential components of a car. The spark plug's role is to generate sparks to ignite the air-fuel mixture in the cylinder, thereby increasing the car's speed. Thus, if there are issues with the spark plugs or high-voltage wires, rapid acceleration may not result in an increase in speed.
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CassandraRose
08/15/25 6:20am
I often drive to work, and sometimes my car lacks power when accelerating, making it hard to pick up speed. This could be related to poor engine air intake, such as a dirty air filter blocking the air inlet, preventing the engine from drawing enough air for combustion, which naturally results in weak performance. If the tire pressure is too low, the increased rolling resistance of the tires can also slow the car down. Worn-out spark plugs causing misfires can reduce power output. If the fuel pump is faulty and fuel supply is insufficient, stepping on the gas pedal will only make the engine groan without moving the car. If the brake system is stuck or not releasing properly, the wheels are dragged, making it even harder to accelerate. Safety is important, as slow acceleration can make overtaking dangerous. It's recommended to pay attention to regular maintenance schedules, frequently replace the air filter and spark plugs, and keep tire pressure at the recommended value. Those who are handy can replace the air filter themselves to save money and hassle. Otherwise, head straight to a repair shop for inspection—don’t delay and affect your driving.
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