Fault In Fuel Injection System

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