Is it normal for a BMW to occasionally stall at a red light?
1 Answers
Not necessarily. New BMW models are equipped with engine start-stop technology. When you stop at a red light by pressing the brake and shifting to N gear until the vehicle comes to a complete stop, the engine automatically shuts off. When the light turns green, shifting to D gear and pressing the accelerator will directly restart the engine. If the engine starts normally when pressing the accelerator in D gear after stalling, then it's functioning as intended. However, if you need to manually restart the engine, it's advisable to visit a professional repair shop. The automatic engine start-stop system is designed to shut off the engine temporarily during stops (e.g., at a red light) and automatically restart it when it's time to move forward. Its English name is STOP&START, abbreviated as STT. The STT intelligent fuel-saving system is a set of controls for engine start and stop. It works by integrating an enhanced motor with idle start-stop functionality into a traditional engine, allowing the engine to completely shut off when idle stop conditions are met. When the vehicle needs to move forward again, the idle start-stop motor system quickly responds to the driver's command, rapidly restarting the engine for seamless operation, thereby significantly reducing fuel consumption and exhaust emissions. STT stands for STOP&START. The STT intelligent fuel-saving system is a set of controls for engine start and stop. The system uses a computer to determine the vehicle's status, such as during stops at red lights or in traffic jams. The computer can automatically stop the engine while maintaining the operation of in-car systems like air conditioning and audio. This technology can save approximately 5% of fuel under normal driving conditions and up to 15% in congested traffic. According to authoritative tests, this technology can help an average car save 10% to 15% of fuel annually.
