Why can't the fuel supply system obtain full transmission power?

[StPatrick]

The fuel supply system's inability to obtain full transmission power is caused by damaged spark plugs and ignition coils or a clogged three-way catalytic converter. Here are the specific details: 1. Damaged ignition coil: Over time, spark plugs and ignition coils may experience reduced ignition efficiency, leading to poor performance in one of the engine's cylinders. This can trigger a fault code in the car. The solution is to replace the ignition coil and spark plugs. BMW engines are equipped with variable valve lift and variable valve timing systems. If these systems malfunction, the engine may not be able to output full power, resulting in the transmission system's inability to obtain complete transmission power. 2. Clogged three-way catalytic converter: A clogged three-way catalytic converter can also prevent the engine from outputting full power. Incorrect ignition timing and ignition advance angle can also contribute to this issue. Therefore, when encountering this problem, it is necessary to visit a 4S shop to use a specialized diagnostic computer to read the fault code, identify the cause and location of the issue, and replace the faulty components.