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Home > Tips and Howtos > Benz DIY Project Tips Tips and Howtos

W124 - Engine Wiring Harness Replacement [Benz DIY Project Tips]
Requested and Answered by Admin on 21-Mar-2005 22:36 (7724 reads)
W124 - Engine Wiring Harness Replacement
I purchased my 1994 E320 two years ago in 2001 and recently began having problems with the idle control and check engine light.� I did my research on this site and a variety of other sources and found that the wiring harness and throttle actuator are common problems due to premature breakdown of the insulation covering the individual wires.� Eventually, the wires touch and cause many strange symptoms.� It is states in the forums that technicians who are knowledgeable about this model will not put serious effort into troubleshooting it until the original harness has been replaced.�

There are all kinds of examples of folks who had a water pump replaced, or head work done that required moving the harness aside.� The problems begin as the car is re-assembled, with resulting shorts inside the harness.� When you cut into one of these, it is no wonder.�

Without going into my specific troubleshooting details, I determined that I needed to replace my main engine harness.� Here are the telltale signs that my harness was original and in poor shape.

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