What Causes Body Shaking at Low Speeds?
2 Answers
Car body shaking at low speeds can be attributed to the following reasons: 1. Severe engine carbon buildup. When there is excessive carbon deposit inside the engine, the gasoline sprayed by the cold-start fuel injector gets largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes starting difficult and causes shaking. 2. Ignition system issues. Poor performance of the ignition system or spark plug misfiring can lead to severe shaking during cold starts. 3. Unstable fuel pressure. Abnormal fuel pump pressure supply, incorrect readings from the intake pressure sensor, or poor sensor performance can all cause body shaking. 4. Aging engine components. Worn-out components may lead to engine mount problems, transmitting vibrations to the steering wheel and cabin, causing shaking during idle.
My old car used to do this often too, wobbling all over the cabin at low speeds. It's mostly tire and chassis issues that are the most common. If the tires have bulges or deformities, the ride gets bumpy, especially noticeable over speed bumps. Wheel rim deformation is also troublesome – once I scraped a curb and the rim got bent, making it feel like sitting on a massage chair at low speeds. Then there's the aging of rubber components in the chassis, worn-out suspension ball joints, or increased play in the steering linkage, all of which can make the car shake badly. Oh, and worn CV joints are a hidden culprit, causing clunking noises when turning. If the brake discs are uneven, you'll feel shaking when lightly braking. The most dangerous is a broken engine mount – even the steering wheel will vibrate. I'd suggest first checking tire pressure and for any wheel rim deformation.
