What Causes Throttle Shuddering?
2 Answers
Throttle shuddering during vehicle operation may be caused by the following reasons: 1. Engine malfunction: Engine misfire or broken high-voltage wires leading to ignition failure, resulting in shuddering. 2. Excessive carbon buildup inside the engine: The gasoline sprayed by the cold-start injector is largely absorbed by carbon deposits, causing the air-fuel mixture to be too lean during cold starts, making it difficult to start and leading to shuddering. 3. Damaged spark plugs: Worn electrode gaps in spark plugs result in insufficient ignition, causing incomplete combustion of the air-fuel mixture and engine shuddering during acceleration. 4. Poor fuel quality: Low-quality gasoline leads to inadequate atomization by the fuel injectors, causing incomplete combustion of the air-fuel mixture in the cylinders and resulting in idle shuddering. 5. Loose wheel bearings can cause the car to shudder while driving. 6. Excessive fuel delivery when pressing the accelerator pedal before the car can respond promptly, leading to shuddering. 7. Loose vehicle frame due to aging can also cause shuddering during acceleration.
When I accelerate, the car shakes, which feels quite unpleasant. There are many possible reasons. It could be due to worn-out spark plugs or faulty ignition coils, as these components can cause irregular ignition when they age, leading to unstable power output. Fuel system issues are also common, such as a clogged fuel pump or excessive carbon buildup in the fuel injectors, resulting in uneven fuel supply and engine vibration. Another possibility is unbalanced tires. Last time I drove an old car that shook badly during acceleration, and after inspection, it turned out to be uneven tire wear or misaligned wheels affecting stability. Drivetrain issues shouldn’t be ruled out either—if the CV joints or differential are damaged, power delivery becomes uneven, causing shaking during acceleration. Loose engine mounts could also lead to body vibrations. I recommend starting with simpler checks, like spark plugs and tires. If you can’t figure it out yourself, take it to a professional shop for inspection—fixing it early ensures safety and peace of mind. Regular maintenance focusing on these areas can help prevent shaking.
