12 13 ... Fault In Fuel Injection System

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. 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.