Eric, the harness in question has many wire bundles to a number of electrical parts, but it is the one that send wires to the ignition coils in the valve cover, the temp sensor in the thermostat, and it also sends some wires to under the front of the valve cover, to the very front of the head. Not sure what all those connectors are for, but check the exposed wires going into the connectors at those locations, guarantee you will see flaking insulation. Try not to move those wires around to much for the moment. If you see any exposed copper or cracks in the insulation, go find some liquid rubber (silicon sealer), squirt a bit into the back of the connector where the wires enter them, when it hardens, it will stabilize those vulnerable areas for a while.

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1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)