BMW 7 Owners & Service Manuals

BMW 7 Series: Ignition Coil

NOTES ON CHECKING IGNITION SYSTEM

Troubleshooting

  • Fault in fuel injection system
  • Spark plug faults
  • Ignition coil faults
  • Further fault patterns with evaluation
  • Additional fault notes for troubleshooting

Oscillograms

  • Normal oscillogram
  • Oscillograms of ignition coils from different manufacturers

Check

  • Secondary signal for stationary ignition distribution

REPLACING IGNITION COILS (N63)

Necessary preliminary tasks

  • Read out fault memory of DME control unit.
  • Check stored error/fault messages.
  • Switch off ignition.
  • Remove left and right INTAKE FILTER HOUSINGS.

IMPORTANT: Ignition coils must not be fouled by fuel.

The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!

Unlock plug catch (1) on ignition coil (2) and disconnect plug.

Pull ignition coil (2) up and out.

This procedure is applicable to all ignition coils.

Ignition Coil<
Fig. 18: Pulling Ignition Coil

Installation: Check that rubber seal of ignition coil (1) is correctly seated.

Ignition Coil
Fig. 19: Installing Rubber Seal Of Ignition Coil

Installation: Push plug (1) with plug catch (2) open onto ignition coil.

Carefully close plug catch (2) in direction of arrow.

The plug catch must snap into place without great effort.

Ignition Coil
Fig. 20: Pushing Plug With Plug Catch Onto Ignition Coil

NOTE: Now clear the fault memory.

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    IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection). NOTE: Follow instructions for removing and installing CONTROL UNITS ! Necessary preliminary work R

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