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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 460 (ENGINE ELECTRICAL SYSTEM - REPAIR)TROUBLESHOOTING12 13 ... FURTHER FAULT PATTERNS WITH EVALUATION
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans

12 13 ... Further Fault Patterns With Evaluation

2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION 12 13 ... Further Fault Patterns With Evaluation
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 and ignition voltage peaks at idling speed:

  1. Normal combustion period.
  2. Normal ignition voltage peak. Ignition system is OK.
    3. Fig 1: Evaluation Of Sparking Period & Ignition Voltage Peaks At Idle Speed
    G00313225Courtesy of BMW OF NORTH AMERICA, INC.

Long sparking period (1) with low ignition voltage peak (2). Indicates low compression.

Fluctuating sparking period: Indicates contamination on spark plug (shunt).

Fig 2: Long Sparking Period With Low Ignition Voltage Peak
G00313226Courtesy of BMW OF NORTH AMERICA, INC.

Short sparking period (1) with high ignition voltage peak. Constant but short sparking period: Indicates defective ignition lead.

Fig 3: Short Sparking Period With High Ignition Voltage Peak
G00313227Courtesy of BMW OF NORTH AMERICA, INC.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.