12 13 ... Fault In Fuel Injection System

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Evaluation of ignition voltage peaks in response to sudden accelerator loads. See Fig 1.

Fig 1: Identifying Ignition System Faults With Oscilloscope

Courtesy of BMW OF NORTH AMERICA, INC.

Beginning of dying-out process is not much higher than ignition voltage peak. Ignition system is OK.
Beginning of dying-out process is considerably higher than ignition voltage peak.
Fault in injection system:
- Lean Mixture.
- Defective Injection Valve.
- Low Compressions.