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 MANUALSBMW2007530XI 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 645 (ENGINE ELECTRICAL SYSTEM - REPAIR)IGNITION COIL12 13... NORMAL OSCILLOGRAM (M, S, W ENGINES ONLY)
2007 BMW 530xi 4D Sedan, Standard
12 13... Normal oscillogram (M, S, W engines only)
2007 BMW 530xi 4D Sedan, StandardSECTION 12 13... Normal oscillogram (M, S, W engines only)
WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, 2001 BMW 525i, and 2000 BMW 528i. However, it is still accessible from the selected car via links, so may be relevant.
- Start of ignition voltage peak. See Fig 1.
- Level of ignition voltage. See Fig 1.
- Level of combustion voltage. See Fig 1.
- Period of combustion. See Fig 1.
- Combustion curve characteristics. See Fig 1.
- Start of decay process. See Fig 1.
- Termination oscillations. See Fig 1.
Secondary voltage patterns, beside one another:
Evaluation of ignition voltage peaks at idle speed (this example shows an engine with 4 cylinders). See Fig 2.
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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.