Ignition System - Ignition Coil Damage Prevention
SI B 12 27 08Engine Electrical Systems
October 2008
Technical Service
SUBJECT
Ignition Coil Faults
MODEL
E60, E61, E71, E82, E88, E90, E92, E93 with the N54 and N63 engines
INFORMATION
Complaints of poor engine performance caused by ignition coil failure with related faults stored
The failed ignition coils have been found to have been damaged by fuel from a previous repair to the injectors or high pressure fuel system.
When working on the high-pressure fuel lines or injectors, all recommended steps in the repair instructions must be followed.
It is essential that all ignition coils be removed (on 8 cylinder engines - all coils of the appropriate cylinder bank) prior to any repair work on any component of the high-pressure fuel system.
The ignition coils must not be contaminated with any fuel residue!
The electrical resistance qualities of the silicone material are reduced considerably once in contact with fuel. This, in turn, can result in the failure of the ignition coil.
This also means that the spark plug shafts must be protected from the ingress of fuel with a shop cloth during repairs.
Before removal or reinstallation of the ignition coils, clean the spark plug shafts with compressed air and inspect to ensure a high level of cleanliness.
WARRANTY
Information only
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