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 MANUALSBMW2010328I 2D CONVERTIBLE, N52, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPENGINE ELECTRICAL SYSTEM - REPAIR - E92/E93TROUBLESHOOTING12 00... INSTRUCTIONS ON COMPRESSION TESTING
2010 BMW 328i 2D Convertible, N52, Standard
12 00... Instructions on compression testing
2010 BMW 328i 2D Convertible, N52, StandardSECTION 12 00... Instructions on compression testing
Cars with automatic transmissions:
- Select drive position "P"
- Apply handbrake
Cars with manual transmissions:
- Move gearshift lever to neutral position
- Apply handbrake
Turn off ignition.
Disconnect DME master relay. This ensures that the DME control unit does not actuate the ignition coils.
If this procedure is not observed:
- High voltage! - Mortal danger!
- Damage to DME control unit (ignition final stages)!
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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.