What causes car shaking when releasing the accelerator pedal?

[PaigeLynn]

Shaking when releasing the accelerator pedal may occur due to insufficient RPM during gear shifting, which is a driving technique issue that can be resolved by the driver. It could also indicate problems with the engine mounts, where engine RPM and vehicle speed resonate at the same frequency. Below are relevant explanations: 1. Causes of shaking: Another possible reason is severe uneven wear on the four tires. Avoid mixing spare tires for high-speed driving - spare tires should only be used temporarily and replaced immediately afterward. You can also check wheel balance and four-wheel alignment, as long-term misalignment may lead to uneven wear. Even with balanced braking force distribution across all four wheels, significant differences in braking effectiveness may still occur, causing shaking. This is usually not noticeable at low speeds but becomes apparent during high-speed braking when greater braking force is required. 2. Solutions: 1) Engine shaking in neutral while stationary; replace engine mounts. 2) Steering wheel shaking when braking at high speeds; replace front brake discs. 3) Body shaking during low-speed rapid acceleration; replace spark plugs. 4) Body shaking when pressing the accelerator that disappears upon release; replace the drive shaft.

[StFernando]

I've experienced a similar situation while driving. When I let off the gas pedal, the car would start shaking, and I could feel the steering wheel vibrating. Later, it turned out the throttle body was too dirty, with carbon buildup causing restricted airflow, which made the engine idle unstable and prone to shaking. Worn-out spark plugs or faulty ignition coils can also cause this—I replaced my spark plugs, and it ran much smoother afterward. Another common cause is worn engine mounts. When you release the throttle, the engine load changes, and if the mounts can't hold it properly, the shaking becomes noticeable. A vacuum leak can also be the culprit, often accompanied by a hissing sound. I recommend checking these basic items first. If the issue persists, take it to a professional shop for a computer diagnosis. Remember, regular throttle body cleaning can prevent bigger problems—don't delay it too long.

[LeEmily]

As a car enthusiast, I've researched that throttle-off shaking is related to the engine control system. A faulty throttle position sensor can cause the ECU to make inaccurate judgments, a stuck idle control valve affects air supply, and incorrect spark plug gaps lead to inconsistent ignition. On the fuel side, clogged injectors or unstable fuel pressure can cause abnormal fuel return. In automatic transmissions, incorrect torque converter clutch engagement timing transmits vibrations to the body. I've personally tried clearing fault codes to trace the source and checked for clogged air filters. If accompanied by abnormal engine RPM, it might indicate vacuum leaks or loose wiring connections. Regular oil changes and spark plug inspections can reduce risks.

[DeMason]

I encountered the issue of engine stalling a few times when I was younger, and it was quite dangerous. The main causes are worn-out spark plugs failing to ignite or impurities in the fuel line causing uneven fuel supply. Aging engine mounts can also intensify the shaking sensation. Excessive carbon buildup in the throttle body can worsen this phenomenon. Don't take it lightly when it happens, especially when releasing the throttle at high speeds, as it can easily lead to loss of control. Drive to a repair shop immediately to have them check the computer data and inspect related components. Don't wait for a minor issue to turn into a major repair—safety comes first. Regular vehicle maintenance, such as replacing spark plugs every two years, can prevent this kind of stalling.