How to Solve the Vibration in D Gear but Not in N Gear?
2 Answers
Here are the solutions for vibration when idling in D gear: 1. Replace the engine mounts. The body and engine are connected flexibly via engine mounts, which help to absorb the vibrations produced by the engine. If the mounts are worn out, the vehicle's vibration issue can become severe; 2. Check the spark plugs. If a spark plug in one of the cylinders fails to ignite properly, it can cause an imbalance in the engine's operation. This leads to significant vibrations during idle and may also result in reduced power; 3. Inspect the fuel supply system. If there is an issue with the fuel supply system, the air-fuel mixture may not meet the combustion standards, causing poor engine performance and increased vibrations.
I often help friends fix this kind of car issue. If there's vibration in D gear but it disappears in N gear, it's mostly due to engine mounts or transmission mounts failing. These rubber pads harden and crack with age, losing their ability to absorb vibrations. In N gear, the engine idles without torque, so it runs smoothly. But in D gear, the engine is under load, transmitting vibrations throughout the car body. A simple self-check: pop the hood and gently shake the engine to check for excessive movement. Best to have a trusted repair shop diagnose it properly—likely the mount bushings are cracked and need replacement. Don't ignore this; prolonged vibration can damage other components like the exhaust system or electrical connections. Timely repairs save money and ensure safer, smoother driving.
