Possible causes of engine detonation when the automatic transmission is engaged:
* Torque converter malfunction: The torque converter connects the engine and automatic transmission and transmits torque. A faulty torque converter can cause detonation when shifting into gear.
*Transmission Damage: Worn or damaged transmission components, such as clutches or gears, can cause vibrations and knocking when the transmission is engaged.
* Low transmission fluid pressure: Insufficient fluid pressure in the automatic transmission can cause the clutches to slip and cause detonation.
* Problems with automatic transmission control electronics: A faulty automatic transmission electronic control unit may shift gears incorrectly, leading to detonation.
* Poor quality transmission fluid: Contaminated or poor quality transmission fluid can cause wear and damage to transmission components, which can cause detonation.
* Incorrect gear adjustment: Incorrectly adjusted gears can cause clutch slippage and knocking when engaged.
* Worn spark plugs or coils: Worn spark plugs or coils can cause misfire, leading to detonation.
* Incorrect ignition timing: Incorrect ignition timing may cause detonation.
*Low Octane Fuel: Low octane fuel is more susceptible to detonation, especially under high loads such as shifting into gear.
Recommended actions:
*Consult a qualified mechanic to diagnose and repair the problem.
* Check the level and condition of the transmission fluid and replace it if necessary.
* Check the torque converter for leaks or noise.
* Inspect the transmission for wear or damage.
* Check and replace worn spark plugs or coils.
* Make sure the ignition timing is set correctly.
* Fuel your vehicle with the recommended octane rating.