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