What Causes the Car to Shake When Accelerating?
2 Answers
The reasons why a car shakes when accelerating: 1. The engine requires sufficient air to operate properly. If there is a leak or blockage in the intake system, the car may shake when accelerating. 2. Worn-out spark plugs or the use of low-quality spark plugs can lead to weak acceleration and shaking. Over time, the car's half-shaft, subjected to long-term torsional fatigue and impact forces, may develop issues such as bending, twisting, breaking, or wear and misalignment of the spline teeth. This can cause the car to shake rhythmically when accelerating within a certain speed range, with the shaking disappearing or reducing when the accelerator is released.
When I accelerate, I feel a strong vibration in the throttle pedal. At first, I thought it was due to uneven road surfaces, but later I noticed it happens every time I press the accelerator, especially on highways. After some research, I realized it might be due to faulty spark plugs causing uneven ignition and engine vibration. This can also affect fuel efficiency, leading to higher fuel consumption. Another common cause is issues in the fuel system, such as dirty fuel injectors or a clogged fuel filter, which can cause unstable fuel pressure and vibrations. A faulty mass airflow sensor can also lead to insufficient air intake and cause similar issues. While aging suspension systems can also cause vibrations, throttle-related vibrations are mostly engine-related. If not addressed promptly, the car's performance may decline, with weaker acceleration or even the risk of breaking down. I recommend getting it checked as soon as possible—start by replacing the spark plugs, and if that doesn’t work, take it to a professional shop for further diagnosis.
