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HOMESERVICE MANUALSMINI2013COOPER COUNTRYMAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 651 (ENGINE ELECTRICAL SYSTEM - REPAIR (M54))TROUBLESHOOTING12 13 NOTES ON CHECKING IGNITION SYSTEM FOR M54 ENGINES12 13... FURTHER FAULT PATTERNS WITH EVALUATION
2013 Mini Cooper Countryman, Standard Trans

12 13... Further fault patterns with evaluation

2013 Mini Cooper Countryman, 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 X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. 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.
Fig 1: Fault Pattern Of Normal System
G00397835Courtesy of BMW OF NORTH AMERICA, INC.

Ignition system is OK.

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

Fig 2: View Of Long Sparking Period
G00397836Courtesy of BMW OF NORTH AMERICA, INC.

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

Short sparking period (1) with high ignition voltage peak.

Fig 3: View Of Short Sparking Period
G00397837Courtesy of BMW OF NORTH AMERICA, INC.

Constant but short sparking period: indicates defective ignition lead.

NOTE: The sparking-voltage line could sometimes be missing completely and the ignition voltage peak could rise very high.
Ignition Voltage Too High:

Electrode Gap Large
Compression High
Fuel Air Mixture Lean
Electrode Temperature Low
Electrode Condition Burnt
Ignition Lead Interrupted
Ignition Voltage Too Low:

Electrode Gap Small
Compression Low
Fuel Air Mixture Correct
Electrode Temperature High
Electrode Condition New
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:

  • • You smell fuel, burning insulation, or see smoke.
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  • • 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.