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Originally Posted by croftynsteph
If knocking around under the hood...check out the wiring harness...the main harness that connects to your plug wires and such...common problem on these cars...and in my case it helped cause a misfire issue...if the insulation is crumbling badly...prepare to pony up some decent money for a replacement or plenty of free time to rewire it yourself...
best of luck
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I might add that the crumbling insulation occurs on the individual wires inside the harness, not the main harness covering. From the outside, nothing will seem amiss, but if you cut away at the main cover, you will see the damage underneath.
I will also add that most W124s that were plagued with this ill have probably gotten this fixed early on...mine manifested itself as a problem around 90K.