What Causes Engine Shaking When Letting Off the Throttle?
2 Answers
Engine shaking when letting off the throttle is caused by the aging and cracking of the rubber cushioning components on the engine mounts, which fail to secure the engine properly. Loose Engine Mounts: The engine inside the engine bay relies on components like engine mounts for support and fixation. If these parts become worn or loose, the engine may shift during operation, leading to noise. To resolve this issue, simply tightening the engine mounts is sufficient. Plastic Component Movement: Another possible cause is the movement of plastic components within the engine bay, such as the engine cover or intake pipes. Once these plastic parts become loose, they may collide with the engine bay, resulting in noise.
Over the years of driving, I've encountered quite a few instances of engine shuddering during throttle lift-off, especially in older vehicles. This issue is often caused by excessive oil sludge and carbon buildup in the engine's throttle body, which affects air intake control and leads to unstable RPM. Aged spark plugs are another critical factor, as delayed ignition can result in incomplete combustion. Fuel system blockages may also contribute to the problem, such as uneven fuel supply due to dirty injectors. I once neglected this issue, and it eventually progressed to rough idling. After taking the car to a repair shop for throttle body cleaning and new spark plugs, the problem was resolved. Regular maintenance practices like using quality gasoline and occasional highway driving to clear carbon deposits can effectively prevent such minor troubles.
