What Causes Car Body Shaking When Accelerating?
3 Answers
Car body shaking when accelerating can be caused by: 1. Clogged fuel lines leading to poor fuel supply; 2. Air intake system leaks or blockages; 3. Damaged ignition coils or spark plugs; 4. Excessive carbon buildup in the throttle body; 5. Faulty fuel injectors; 6. Clogged fuel filters. The functions of the accelerator pedal are: 1. Controlling engine speed by adjusting the pedal depression amount; 2. Determining engine output power through carburetor control. The working principle of the accelerator is: When the pedal is pressed, it directly controls the throttle body. The throttle opening increases, allowing more air into the engine. The ECU then commands the fuel injection system to increase fuel delivery, causing the engine speed to rise and the vehicle to accelerate.
I'm familiar with this issue when the car shakes upon stepping on the gas. It's mostly caused by problems in the ignition system, such as worn spark plugs or faulty ignition coils, leading to a cylinder misfire and unbalanced engine operation. It could also be due to high-voltage wire leakage or poor contact in the cylinder wires. My old car had the same issue, most noticeable when cold, but it improved after cleaning the throttle body and fuel injectors. Poor fuel quality can also cause carbon buildup, affecting ignition. Quickly check the spark plug gap and combustion condition; replace the entire ignition system if necessary to avoid engine damage and excessive fuel consumption. If the shaking is severe during rapid acceleration, it might even cause the exhaust pipe to vibrate, so it's best to address it early.
When accelerating, the vehicle body shakes, and the issue may lie in the fuel system. I've encountered situations where the fuel pump pressure was insufficient or the fuel injectors were clogged, causing uneven fuel injection and incomplete combustion, leading to shaking. Additionally, a dirty fuel filter can restrict fuel supply, or water may have entered the fuel tank. I remember during a previous repair, a leak in the intake manifold was found, disrupting the air-fuel mixture ratio and causing shaking. It's also worth checking if the air flow meter and oxygen sensor data are accurate, as these can affect performance. It's advisable to first read the fault codes. If none are found, starting with replacing the filter and cleaning the fuel lines is a more straightforward troubleshooting approach.
