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'01-E320 & 02-ST2
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Discussion Starter #1
I keep thinking about a CE or maybe even a cab.

I can deal with a head gasket...since that seems to be nearly inevitable with the M104. ;)

But I'd prefer to avoid the biodegradable harnesses...so which model years are safe so far as the engine harness goes?

Thanks in advance.
 

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89 300E; 00 E320
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2,510 Posts
MODEL .................YEARS ....CHASSIS ...ENGINE .........TRANSMISSION ....STEERING

300CE .................1987-89... 124.050 ...103.983 KE..........717.4/722.3.........LS68
300CE .................1990-92 ...124.051... 104.980 KE .........717.4/722.3 ........LSH068/C068
300CE .................1993-96... 124.052 ...104.992 HFM .......717.4/722.369 ....765.908
300CE Cabriolet ....1993-96 ...124.066 ...104.992 HFM .......717.4/722.369 ....765.904
 

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1993 300CE Cabriolet (mine) ; 1994 E320 Wagon (wife's) ; 1990 Benz 300E 2.6 (son's)
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6,752 Posts
MODEL .................YEARS ....CHASSIS ...ENGINE .........TRANSMISSION ....STEERING

300CE .................1987-89... 124.050 ...103.983 KE..........717.4/722.3.........LS68
300CE .................1990-92 ...124.051... 104.980 KE .........717.4/722.3 ........LSH068/C068
300CE .................1993-96... 124.052 ...104.992 HFM .......717.4/722.369 ....765.908
300CE Cabriolet ....1993-96 ...124.066 ...104.992 HFM .......717.4/722.369 ....765.904
this is a list of all CE's with problematic wiring harnesses? or what?
 

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Trek 520
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Check, my 91 is "safe" so to speak. But the guys that have replaced them made it sound really easy. "unplug a connector from the old harness, plug in one from the new, repeat until it's finished". One connector at a time here is the key to keeping it simple. Probably the larger challenge will be to dress it in.

Maybe some folks that have completed the job will suggest the correct cable ties?
 

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89 300E; 00 E320
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this is a list of all CE's with problematic wiring harnesses? or what?
No, just a list of CE's. Of course it does show the HFM and the KE years as well as the w103 and w104 years in case one would have a preference.

I don't know for a fact when the bad harnesses were used on CE's but if deanyel is right then you could combine his post with this chart and narrow down the choices a bit if you did not want to mess with a harness issue.
 

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'01-E320 & 02-ST2
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Discussion Starter #8
It's HFM 3.2 liters that have the problem, so 1993 to 1995. To me it's a lesser problem than a head gasket.
Thanks for the detail, I appreciate it.

I didn't mean to downplay the head gasket; either sucks. But I can DIY the head gasket, so it's mostly my labor and a few hundred in parts and machine shop labor if I want to do a valve job with it off. Plus...it seems to be inevitable with the M104, just a matter of time.

Since the harness is limited in scope, if I can avoid that, I'd like to. Aside from the expense, there's always something screwy when you're doing an entire harness sub-assembly. Yuck. Just like a root canal or an IRS audit, you try to avoid certain unpleasantries, no?
 

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94 E320
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209 Posts
The Harness is about as simple as it gets - Takes less than a couple of hours. you start at the brain box and remove what is there. You'll have to remove the bulkhead from behind the head (Same as you would if you were doing a head gasket or blower motor replacement). You will also need to remove the cover over the spark plugs and as part of the harness there is a loom which runs down the throttle side of the valve cover, with a couple of legs running here and there. Overall not a big deal. Go the the junk yard and look for one that has been replaced and that will save you a ton of money. Just check the wires to make sure the insulation isn't cracking. Another thing to look for is a label (near the brain box) that does NOT have the mercedes star on it. If it has "delphi" on it than it is made with proper wire insulation (and is a replacement). If you find a really nice coupe or cabriolet, I wouldn't let the fear of the harness stop my purchase. Head gasket is a real pain compared to the harness, but again not a show stopper if you find a nice coupe or cabriolet. The head gasket job will be more than a couple of hundred by the time you are done. Parts will be closer to $400 (gasket, head bolts, assorted hoses and pulleys, and sundry other items (belt/ belt tensioner comes to mind as does plugs and wires). Believe me it adds up quick and then there can be machine shop bill if the head isn't flat. Sorry, ranting a little bit here - my only point is be careful what you wish for - LoL! And good luck finding that special coupe or cabriolet.
 

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2001 C320 W203 Black on Black. 1997 E320 W210 Silver (RIP). 1995 E320 W124 Pearl Black.
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595 Posts
I agree the harness was not a big deal, both my 95 and 97 E320 had the infamous M104 and HG leaking, not that bad I don't need to add oil between oil change at 10Km but just a nuisance. Just keep cleaning it every 2-3 week so it won't drip on the drive way and garage floor. might tacking on this job some day, had experiences on Jap Toyota, Honda and Nissan car but never try/do on MB yet.
 
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