What Causes the Car Throttle to Be Unstable and Jerky?
3 Answers
It could be a fault in the fuel supply. If the fuel pump pressure is insufficient, it may be due to prolonged periods without refueling, leading to premature aging and damage of the fuel pump. It is recommended to replace the fuel pump. Below are some related explanations: 1. Clogged Fuel Filter: If the fuel filter is clogged or leaking, it can also result in insufficient fuel supply, causing the car to jerk after pressing the throttle. It is advisable to replace the fuel filter and test drive to see if the issue resolves. The fuel filter typically filters large particulate impurities from gasoline, improving fuel quality, and generally needs replacement every 1-2 years. 2. Clogged Fuel Injector: This can lead to poor fuel atomization, potentially causing the air-fuel mixture to become too lean, resulting in misfires in one or multiple cylinders, and severe engine shaking at idle or during acceleration. After removing the fuel injector, use a specialized tester to evaluate its performance (usually by measuring fuel injection volume per unit time and observing atomization effects). Be sure to remove and install the injectors in the correct order, and if replacing with a new injector, ensure it is properly matched with the car's computer system.
Recently, my car has been experiencing unstable throttle response with jerking movements, which worries me a lot. After researching, I found there are several common causes for this issue: First, it could be a problem with the throttle pedal or its sensor, such as erratic signals from the position sensor leading to uneven acceleration; secondly, there might be leaks or blockages in the intake system, where accumulated dust affects airflow; fuel system issues like clogged injectors or unstable fuel pump pressure can also cause engine hesitation; ignition system faults, such as worn-out spark plugs, may lead to intermittent power loss; lastly, transmission problems, especially clutch slippage in automatic cars, could be the culprit. This issue needs immediate attention because sudden jerking while driving is dangerous and can lead to loss of control. I recommend taking it to a professional repair shop right away for inspection—don’t delay.
I feel the throttle is unstable and jerky, and the key is to check a few easily overlooked points. First, the throttle position sensor may be inaccurate, causing the computer to misinterpret acceleration signals. Second, the air flow meter might be dirty, leading to poor air intake and an imbalanced air-fuel mixture. Third, a vacuum hose leak can cause engine vibration and sluggish acceleration. Fourth, aging ignition coils or dirty fuel injectors can affect fuel combustion efficiency. Fifth, a faulty automatic transmission sensor can cause rough shifting and jerking. It's recommended to start by cleaning the sensors and checking the hoses. This issue is annoying, but fixing it early can prevent major problems.
