Possible causes of vibration in an engine with an automatic transmission:
In neutral position:
* Unbalanced flywheel
* Unadjusted engine mounts
* Faulty torque converter
*Transmission oil pump faulty
When driving:
* Incorrect transmission fluid pressure or level
* Worn or dirty channels in the transmission housing
* Worn or damaged clutch band or pack
* Loose drive shaft intermediate support
* Faulty bearing in gearbox
* Incorrectly adjusted gear selector cable
Additionally:
* Worn or damaged spark plugs or ignition coils (may cause vibration when idling, but goes away when driving)
* Faulty injectors (can cause intermittent vibration at idle or when accelerating)
*Low battery voltage (may cause transmission fluid pressure fluctuations)
* Faulty engine or suspension mounts
Diagnostics and troubleshooting:
*Checking the transmission fluid level and condition: Make sure the fluid level is correct and the transmission fluid is clean and does not have a burning smell.
* Inspect Engine Mounts: Inspect the engine mounts for wear or damage and tighten all bolts to the correct torque.
*Checking and adjusting the gear selector cable: Make sure the cable is adjusted correctly to ensure smooth gear shifting.
*Transmission Maintenance: Follow the manufacturer’s recommendations for changing the transmission fluid and filter according to your maintenance schedule.
* Professional Diagnosis: If the problem persists, seek professional diagnosis as specialized equipment may be required to identify the exact cause.