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What's the reason for a car not accelerating smoothly and jerking after starting?

2 Answers

LaAnnie

07/25/25 4:04am

If the car is not accelerating smoothly and jerking, check whether the fuel injectors and fuel supply system are faulty. Below is the content about the car not accelerating smoothly with abnormal sounds: 1. If the fuel injectors are faulty, it will cause the car to jerk when accelerating. It is recommended to regularly check whether the fuel injectors are faulty. After long-term use, carbon deposits may occur on the fuel injectors, affecting their normal operation. If the carbon deposits on the fuel injectors are severe, adding fuel additives to the fuel tank can reduce the carbon deposit phenomenon. 2. The main causes of fuel injector failure are fuel and filter issues, such as using inferior diesel, long-term use of the filter element without cleaning or replacement. It is recommended to use fuel that meets national standards and regularly clean the fuel filter to prevent excessive fuel impurities from clogging the fuel injectors.

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Finley

08/10/25 5:15pm

I've also experienced the issue of the car not accelerating smoothly and jerking after startup before, which is quite common. It's mostly due to poor fuel delivery, such as a weak fuel pump or clogged fuel lines with dirt, causing intermittent fuel supply and jerking when accelerating. The ignition system could also be faulty, like worn-out spark plugs or a bad ignition coil, leading to misfires and engine jerking. Last time my car had this issue, replacing the spark plugs improved it. I recommend checking if the air filter is clogged, as insufficient air intake also affects combustion. Alternatively, it could be a transmission problem, especially with automatic transmissions where rough shifting can cause jerking. For safety, avoid forcing the car to drive; instead, stop and check simple components. If that doesn't help, visit a repair shop to read the fault codes with a diagnostic tool. Regular maintenance can prevent such issues, and delaying repairs may lead to more severe engine wear and higher costs.

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