When shifting gears of an automatic transmission (automatic transmission), engine movement may be observed, mainly caused by the following reasons:
1. Faulty or worn engine mounts:
* Engine mounts absorb vibrations and provide engine stability. Worn or damaged mounts can become loose and allow the engine to move when shifting gears.
2. Automatic transmission malfunction:
*A faulty torque converter, planetary gearbox, or electronic control unit (ECU) can cause rough shifting, causing the engine to move.
3. Transmission cardan malfunction:
* The driveshaft transmits torque from the automatic transmission to the rear wheels. A worn or unbalanced driveshaft can vibrate at certain speeds, causing the engine to move.
4. Transmission oil problems:
* Insufficient or contaminated transmission oil can prevent smooth shifting, causing the engine to move.
5. Malfunction of automatic transmission sensors:
*Vehicle speed sensors, engine speed sensors and shift position sensors provide vital information to the automatic transmission ECU. Faulty sensors can transmit incorrect data, resulting in incorrect gear shifting and engine movement.
6. Incorrect automatic transmission settings:
*In some cases, incorrect automatic transmission settings can cause excessive clutch pressure or shift delays, resulting in engine movement.
7. Engine mechanical problems:
* Worn crankshaft mounts or a damaged flywheel can also cause the engine to move when shifting gears.
To resolve this problem, a thorough diagnosis must be carried out to determine the exact cause. This may include a visual inspection, computer diagnostics and a test drive. Repairs will depend on the identified fault.