12 13 Notes on checking ignition system
WARNING: This page is about a different car, the 2005 BMW 530i, 2005 BMW 525i, 2004 BMW 530i, and 2004 BMW 525i. 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