12 13 Notes On Checking Ignition System
WARNING: This page is about a different car, the 2008 BMW 760Li and 2007 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
Troubleshooting Fault in fuel injection system
Spark plug faults
Ignition coil faults
Further fault patterns with evaluation
Additional fault notes for troubleshooting
Oscillograms Normal oscillogram
Oscillograms of ignition coils from different manufacturers
Check Secondary signal for stationary ignition distribution