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 MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 460 (ENGINE ELECTRICAL SYSTEM - REPAIR)TROUBLESHOOTING12 13 ... SPARK-PLUG FAULTS
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
12 13 ... Spark-Plug Faults
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION 12 13 ... Spark-Plug Faults
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
Evaluation of sparking period at idling speed.
- Normal ignition voltage peak. Spark plug is OK.
- Low ignition voltage peak. Small electrode gap.
- High ignition voltage peak. Large electrode gap.
Evaluation of sparking period at idling speed:
- Normal combustion period:
- Spark plug is OK
Long combustion period:
- Small electrode gap.
Short sparking period:
- Large electrode gap.
RENDER: 1.0x
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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.