12 13... Ignition coil faults

Evaluation of ignition voltage peaks and attenuation process at idling speed.

1. Beginning of attenuation processes with normal peaks upwards and downwards
2. Beginning of attenuation processes strongly shortened Ignition coil is defective!
3. Absence of initial downwards attenuation

Fig 1: Evaluation Of Ignition Voltage

Courtesy of BENDIX HEAVY VEHICLE SYSTEMS GROUP.

Ignition coil is defective!

Evaluation of sparking voltage line at idling speed.

1. Normal combustion period
2. Normal attenuations to sparking voltage line

Fig 2: View Of Normal Condition

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is OK.

1. Shorter sparking period
2. Attenuation to sparking voltage line is only slight.

Fig 3: Evaluation Of Sparking Voltage - Shorter Period

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is defective!

1. Much shorter sparking period
2. Attenuations to sparking voltage line absent.

Fig 4: Evaluation Of Sparking Voltage - Much Shorter Period

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is defective!

No sparking voltage line

Fig 5: Evaluation Of Sparking Voltage - No Sparking

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is defective!

Evaluation of combustion voltage line at raised engine speeds approx. 1500 min-1.

1. Normal combustion period
2. Normal attenuations to sparking voltage line

Fig 6: View Of Normal Combustion Period

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is OK.

1. Shorter sparking period
2. Attenuation to sparking voltage line is only slight.

Fig 7: Evaluation Of Combustion Voltage - Shorter Sparking Period

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is defective!

1. Normal combustion period
2. Attenuations to sparking voltage line absent.

Fig 8: Attenuations To Sparking Voltage Line Absent

Courtesy of BMW OF NORTH AMERICA, INC.

Ignition coil is defective!