i have a 95 E320 with 93k miles. i don't think the wiring harness was ever changed. the car has regular 7500 mile maint. since new, they never mentioned anything regarding this. should i just change it at the next service anyway? thanks. also, should shocks be changed at this mileage? it still 'ride' pretty good but most likely there's some gradual deterioation which i cannot feel.<br> norman<br>
The 6 cylinder engine has no wiring harness issues. The v8's do, as well as the v12's, due to heat build up. If it isn't giving you any problems don't worry about it. <br> <br> The shocks on these cars are really good. Bilsteins are standard. Check them, look for leaking. Unless the are I would leave them alone, unless there is something really noticable in your handling.
Actually, that's not true. the 93-95 M104 is notorious for main wiring harness deterioration. I should know, we had a 94 wagon. The problem only became evident when the head had to come off for a gasket change (gee, what a surprise). Removing and shifting the sheathed harness around caused the brown insulation on the wires to the coils to virtually turn to powder and flake away.
Correct. All engine wiring harnesses on M104 engines from 93-95 are bad. MB changed the insulation on the wires to help them to be more 'recycleable'.<br> Well, the insualtion deteriorates in the car, and if you carefully cut open the black covering to the harness, the insualation will look like its 2,000 years old. It will be flaking off and maybe crumbled to dust.<br> Wiring harnesses on 92-95 M119 V8 engines do sometimes fail, but only due to heat, and the incidence of failure is quite small comapared to M104 engines. M104 engines are in 93-95 300E / E320's, 94-95 C280's, and 93-95 S320's.<br> <br> Some dealers are replacing them on a 'goodwill' policy, up to 120,000 miles, or so I've heard. It depends on if you bought the car from them or not, and have taken your car there for service. I guess it is in their best interest to take care of their customer. If you didn't buy the car from them or take it in for service, I don't think you'll have much luck.<br> You may have to get the area rep involved.<br> <br> If it were me and it hadn't been replaced, I'd replace it immediately. I've seen bad harnesses cause all sorts of expensive damage, taking out ECU's, throttle actuators, etc. The harness itself is about $550, and an average MB mechanic can replace it in about 3 hours. It's a very common replacement item on these cars, and any independent MB mechanic should've replace dozens.<br> Good luck.
Chris<br> if this is a 'known weak point', how come it hasnt been brought up in any of my routine maint. by the mech? i didnt know until i started reading here. U think i can go to my dealer who service my car and 'complain'? I assume the replacement wiring harness is a better product?<br> thanks<br> norman<br>
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