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Home >> BMW >> 2009 >> X5 35d >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Engine Electrical System - Repair (M54)) >> Troubleshooting >> 12 13 Notes on checking ignition system for M54 engines >> 12 13... Fault in fuel injection system

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