Engine mounts absorb the vibration of the engine and prevent it from being transferred to the rest of the vehicle. Worn or damaged motor mounts can cause the engine to vibrate excessively when idling, especially when in drive.
2. Vacuum Leak
A vacuum leak can cause the engine to run lean and misfire, which can also lead to engine vibration. Common vacuum lines include the PCV hose, EVAP purge line, and brake booster line.
3. Spark Plugs
Worn or damaged spark plugs can cause the engine to misfire, which can also cause the vehicle to vibrate. Check the spark plugs and replace them if they are worn or damaged.
4. Fuel Injectors
Dirty or clogged fuel injectors can cause the engine to run lean or misfire, which can also lead to engine vibration. Check the fuel injectors and replace them if they are dirty or clogged.
5. Transmission Mount
Worn or damaged transmission mount can cause the vehicle to vibrate when it is stationary but in drive. Inspect the transmission mount and replace it if it is damaged or worn.
6. Driveline Issues
A worn universal joint, propeller shaft, or differential could also cause a vibration when the vehicle is in stationary but in Drive.
