Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2011M3 4D SEDAN, AUTOMATIC DCTREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPENGINE ELECTRICAL SYSTEM - REPAIR - E90TROUBLESHOOTING12 13 NOTES ON CHECKING IGNITION SYSTEM
2011 BMW M3 4D Sedan, Automatic DCT
12 13 Notes on checking ignition system
2011 BMW M3 4D Sedan, Automatic DCTSECTION 12 13 Notes on checking ignition system
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
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.