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12 13... Fault in fuel injection system

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Evaluation of ignition voltage peaks in response to sudden accelerator loads.

Fig 1: Identifying Ignition System Faults
G00313212Courtesy of BMW OF NORTH AMERICA, INC.
  1. Beginning of dying-out process is not much higher than ignition voltage peak. Ignition system is OK.
  2. Beginning of dying-out process is considerably higher than ignition voltage peak. Fault in injection system:
    • lean mixture.
    • defective injection valve.
    • low compressions.