What are the causes of car shaking during acceleration?
2 Answers
The causes of car shaking during acceleration are as follows: 1. Fuel system malfunction: When accelerating, depressing the clutch to shift gears will result in a sharp drop in RPM accompanied by shaking, especially noticeable in manual transmission models; 2. Half-shaft malfunction: When accelerating within a certain speed range, the front of the car will exhibit rhythmic bouncing, which disappears or lessens upon releasing the throttle; 3. Insufficient fuel injection or low fuel pressure can also cause the car engine to shake during acceleration. Insufficient fuel injection is mainly due to injector failure, which could be caused by excessive carbon buildup or mechanical issues, requiring individual inspection. If a fault is detected, cleaning the injectors can be attempted first; 4. Low fuel pressure. This is mostly due to fuel pump issues or fuel filter problems. Some car owners neglect the replacement of the fuel filter, which can easily lead to shaking during acceleration.
Last time I drove our family's old car, I also encountered the acceleration shudder issue. At first I thought it was due to uneven road surface, but later found that the steering wheel would shake violently whenever I accelerated beyond 60 km/h. The mechanic diagnosed it as failed front wheel dynamic balance - the two front tires hadn't been rebalanced after patching. The mechanic said wheel rim deformation or tire bulging could also cause this, especially after hitting potholes. If the entire car body shakes during hard acceleration, then the engine mount rubber cushions need checking - when those rubber parts age and crack, they can't contain the engine vibrations anymore. Finally, he reminded me that if the shaking is accompanied by clunking sounds, it might mean the driveshaft CV joints are about to fail. Not fixing those promptly could lead to roadside breakdowns, which would be really troublesome.
