What Causes a BMW to Suddenly Lose Power While Driving?

[McSimon]

There are four main reasons why a BMW may suddenly lose power while driving: electronic throttle failure, air intake system leakage, poor fuel quality, and ignition system issues. Electronic Throttle Failure: If the throttle position sensor is dirty or has voltage imbalance, it can cause electronic throttle failure, resulting in situations where the vehicle cannot accelerate even when the throttle is fully depressed. Air Intake System Problems: If electronic throttle issues are ruled out, attention should be turned to the engine's air intake, fuel system, and ignition systems. As mentioned earlier, the throttle position sensor signal is part of the air intake system. For the engine to function properly, it requires sufficient air. If there is leakage or blockage in the air intake system, symptoms such as reduced power, inability to increase RPM, and vehicle shaking may occur when accelerating. Ignition System Problems: Ignition high-voltage wires rarely fail, so the main issues usually lie with the ignition coils and spark plugs, as these are wear-and-tear components. Worn-out spark plugs or the use of inferior-quality spark plugs can lead to symptoms like weak acceleration and shaking during acceleration.