What Causes Vehicle Body Shaking When Accelerating Hard?

[LeDaniella]

Vehicle body shaking when accelerating hard can be caused by: 1. Damaged spark plugs, excessive wear of the spark plug electrode gap leading to insufficient spark energy, incomplete combustion of the air-fuel mixture causing shaking during acceleration, or cracks in the ceramic part of the spark plug resulting in no spark; 2. Poor fuel quality, leading to inadequate atomization by the fuel injectors and incomplete combustion of the air-fuel mixture in the cylinders; 3. Faulty oxygen sensor. The throttle, also known as the accelerator or air valve, is a control device that regulates the engine's power output. It controls the opening of the carburetor's throttle valve to adjust the cylinder's filling volume, thereby determining the engine's output power.

[TimothyAnn]

My old car had the same issue before - when I stepped hard on the gas pedal, the whole body would shake. This is actually quite common, mostly caused by the engine not getting enough 'food' or having 'leaks'. For example: spark plugs needing replacement, aging ignition coils, or clogged fuel injectors making the engine work inefficiently and shake under load. It could also be due to a long-unreplaced air filter restricting airflow, causing insufficient air supply during hard acceleration. Don't forget to check the engine mounts too - when those rubber cushions age, they lose their damping effect, allowing engine vibrations to transmit directly into the cabin. For cars with over 100,000 kilometers, thick carbon deposits in the cylinders (enough to write with) can also be troublemakers. I recommend going to a repair shop immediately to read the trouble codes and perform basic checks on spark plugs, ignition coils, etc.

[SanSawyer]

I've encountered the issue of car body shaking when accelerating several times. Honestly, the most common cause is ignition system problems - when one of the four spark plugs fails, the engine stumbles like walking with a limp. Fuel system issues are another culprit, especially insufficient fuel supply from the fuel pump or clogged fuel injectors. When you press hard on the accelerator and the fuel can't keep up, the car immediately protests. A dirty throttle body (accumulated carbon deposits causing unstable air intake) will definitely cause shaking during sudden acceleration. Don't forget to check engine mounts - when the rubber deteriorates and loses its damping effect, vibrations transmit directly into the cabin as RPM increases. Driveshaft problems can also cause shaking, though this usually becomes noticeable during turns. None of these issues are difficult to diagnose - just use an OBD scanner to read trouble codes and perform targeted repairs.

[AdalineRose]

Last month my car was doing the same thing, the whole body would shake when I stepped harder on the gas. The mechanic first checked the ignition system, and it turned out one of the spark plugs in a cylinder was bad. After replacing it with a new one, the situation improved immediately. He reminded me that this kind of shaking is most likely caused by a misfiring cylinder, and the ignition coil has a high probability of being damaged. It could also be due to insufficient fuel supply from the fuel pump, especially in older cars where a clogged filter is more common. Additionally, worn engine mounts can exacerbate the shaking, as rubber components tend to harden and crack after about five years. If you’ve just filled up with low-quality gasoline, carbon buildup on the fuel injectors can also lead to this issue. Don’t delay in addressing the problem, as shaking in the powertrain can affect handling and safety.