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the typical harness that needs replacing includes the wiring for the injectors and the coils.
Look to any part of the harness where you can see the insulation on the actual wires. The cam timing solenoid and the temp sensors at the front of the motor are about the only wires with a small part of insulation exposed. There also is a single ground wire on the intake that can be seen. You might have to cut the outside jacket to really see it. I am attaching a photo I used in my article on 104 headgaskets. It is from 104 motor in a SL320.
Although I recommend replacing any harness seen to be in any state of this condition. I have never seen one sorta bad. The bad ones are trash and the good one will show no affect at all. I tend to believe your problem is probably a lot simpler. I find great incidence of single cylinder misfires from arcing plug connectors under the three coils. It only takes a couple misfires til the controller sees it and turns the injector off on the failing cylinder. Once that happens the misfire is permanent till the next key cycle as you have seen. You may have only had a couple misfires, but once recognised they are continuous because of the injector being turned off to protect the catalyst.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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