If you're experiencing unusually high acceleration when you cold start your Pulsar vehicle, there could be a few potential reasons for this issue:
Engine Idle Control: Modern vehicles often have an engine idle control system that adjusts the engine's RPM (revolutions per minute) during startup and idle conditions. If this system malfunctions, it may cause the engine to rev higher than usual, resulting in increased acceleration.
Throttle Position Sensor: The throttle position sensor (TPS) monitors the position of the throttle pedal and relays that information to the engine control unit (ECU). If the TPS is faulty or sending incorrect signals, it may cause the ECU to interpret a higher throttle position, leading to increased acceleration.
Vacuum Leaks: A vacuum leak in the engine's intake system can cause a higher-than-normal air-to-fuel ratio, resulting in increased engine power and acceleration. Cold starts may exacerbate this issue, as certain components expand with heat and seal the leak to some extent during warm operation.
Fuel Injection System: Problems with the fuel injection system, such as a stuck open fuel injector, can cause an excess amount of fuel to enter the engine during startup. This rich fuel mixture can lead to increased acceleration until the engine warms up and the fuel mixture stabilizes.
Electronic Control Unit (ECU) Malfunction: The ECU is responsible for controlling various engine functions. If the ECU is malfunctioning or receiving incorrect data from sensors, it may cause abnormal acceleration during startup.
To diagnose the specific cause of the acceleration issue, it is recommended to have your vehicle inspected by a qualified mechanic. They will be able to perform diagnostic tests, check for error codes, and conduct a thorough inspection of the relevant components to pinpoint the exact cause and recommend the necessary repairs.