How We Solved an Engine Misfire — BMW 7 Series G12 (2018)

A 2018 BMW 7 Series G12 arrived at our service with an engine misfire issue, noticeable through irregular engine performance and loss of power. The vehicle had already undergone an initial inspection elsewhere, where a faulty ignition coil was suspected, but the problem persisted. Our goal was to identify the true cause and resolve it without unnecessary part replacements.

Diagnosis and Problem Resolution

We focused on detailed diagnostics and a systematic elimination of possible causes:

• reading fault codes and analyzing ECU data
• checking ignition coils and their functionality
• identifying the specific cylinder affected
• inspecting spark plugs and their condition
• cleaning and replacing the faulty spark plug
• testing engine performance after repair

It turned out that the issue was not the ignition coil, but a defective spark plug. Once replaced, the engine ran smoothly and without misfire
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Frequently Asked Questions

1. What causes engine misfires?

‍Most commonly faulty spark plugs, ignition coils, or issues within the fuel system.

2. How can I recognize this problem?

‍The engine runs unevenly, loses power, and the check engine light may appear.

3. Is it necessary to replace all components?

‍Not always. Proper diagnostics help identify the exact cause and avoid unnecessary costs.

Conclusion

The 2018 BMW 7 Series G12 underwent detailed diagnostics that revealed the true cause of the misfire. Thanks to a precise intervention, we resolved the issue quickly and efficiently without unnecessary replacements.