What Causes the Car Body to Shake When Lightly Pressing the Accelerator?

[LaHector]

The reason for the car body shaking when lightly pressing the accelerator is due to damaged spark plugs or poor-quality gasoline. Here are the specific explanations: 1. Damaged spark plugs: When spark plugs are damaged, the gap between the spark plug electrodes wears out, leading to insufficient spark plug ignition. This results in incomplete combustion of the air-fuel mixture, causing shaking during acceleration. Additionally, if there are cracks in the ceramic part of the spark plug, it may fail to ignite, causing one cylinder to stop working, which also leads to shaking during acceleration. 2. Poor-quality gasoline: This can result in poor atomization by the fuel injector, leading to incomplete combustion of the air-fuel mixture in the cylinder, which can cause idle shaking. It is recommended to use higher-grade gasoline after finishing the current tank and to perform a fuel system cleaning.

[Miles]

I've been driving for over a decade and have encountered the issue of car body shaking when lightly pressing the accelerator several times. The most common cause is carbon buildup in the engine, which leads to uneven cylinder ignition and reduced engine power. It could also be due to aging spark plugs or improper gaps—just pull them out during inspection to check the erosion level. If the air filter is clogged, restricted airflow can cause shaking too, and replacing it only costs a few dozen bucks. Don’t overlook the fuel system either; carbon buildup in the injectors or a weak fuel pump can lead to unstable fuel supply and shaking. Worn drive shafts or low transmission fluid can also be culprits. Try to avoid frequent low-speed, short-distance driving to minimize carbon buildup. If the shaking happens during startup, the ignition coil might need adjustment. I’d recommend using an OBD tool to read the fault codes first for a quick diagnosis before heading to the shop—better safe than sorry.

[ReaganFitz]

Friend, last time I drove, the car body shook noticeably when I lightly pressed the accelerator, especially during low-speed acceleration. After checking, it turned out the spark plugs were worn out—they had been in use for almost five years and needed replacement. After installing new spark plugs, the car immediately ran much smoother. Another possible cause could be a dirty air filter blocking airflow, which you can easily remove, clean, or replace yourself by following online tutorials. Carbon buildup in the fuel system is also a common issue; if the fuel injectors get clogged, fuel can't spray properly. Adding a bottle of fuel additive and driving on the highway can help clean it out. Additionally, loose engine mounts or transmission problems can also cause shaking, so it's best to have them checked. Don’t delay repairs—shaking at high speeds is really scary, so address it promptly for safety first.

[ElizaDella]

I experience body shaking when lightly pressing the accelerator, usually caused by engine carbon buildup, especially noticeable at low speeds or idle. Worn spark plugs are one of the main reasons, as increased gap can lead to ignition failure. A clogged air filter restricts air intake, affecting combustion efficiency. Dirty fuel injectors can also cause this issue. It's recommended to perform regular maintenance and use high-quality fuel to reduce carbon deposits. If the shaking is severe, check the engine mounts or transmission components to prevent worsening and ensure safety.