Possible reasons:
* Crankshaft position sensor malfunction: The sensor provides critical information about ignition timing and fuel injection. A faulty sensor can give incorrect signals, which leads to the engine stalling when the gear is engaged.
*Camshaft position sensor malfunction: This sensor also provides important information to the engine management system. A faulty sensor can disrupt the timing of ignition and fuel injection, causing the engine to stall.
* Malfunction of the automatic transmission input shaft speed sensor: This sensor tells the engine management system about the speed of rotation of the transmission input shaft. If it is faulty, the engine may not sync properly with the transmission, causing it to stall.
* Torque converter problems: The torque converter connects the engine to the transmission. A faulty torque converter can cause problems with torque transmission, causing the engine to stall.
* Throttle cable problems: The throttle cable connects the accelerator pedal to the throttle body. A faulty cable can prevent the throttle position from changing when shifting into gear, causing the engine to stall.
* Engine Control Unit (ECU) malfunction: The ECU is the ‘brains’ of the engine and controls all its functions. A faulty ECU can interfere with fuel delivery, ignition and other engine parameters, leading to stalling.
* Clogged Fuel Filter: A clogged fuel filter can restrict the flow of fuel to the engine, resulting in loss of power and difficult starting.
How to troubleshoot:
*Connect a diagnostic scan tool to the vehicle to check for trouble codes.
* Check and replace faulty sensors or components.
* Check and adjust the throttle cable.
* Replace clogged fuel filter.
* Reprogram or replace the faulty ECU.
*Consult an experienced mechanic for further diagnosis and repair.