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#1
04-20-2010, 10:22 PM
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Advise me how to fix this
I am tracing down a grounding issue in my engine as i posted a few days ago....
My oil pressure sender is driving me nuts...it is a new unit, and i rebuilt the wiring harness for it myself as the old one was crumbling....it reads pressure correctly...but occasionally gets jumpy responding to electric load. for example, tonight it was raining, and while at idle, the gauge will become jumpy once the windshield wiper moves?!...then it settles back to normal.....is this a problem at the cluster side or at the engine side? i have checked all grounding points i could think of in the engine bay, but cannot see anything out of order....will grounding the cluster itself fix this? thanks,,,,
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1993 300E, 2.8 M104 ..... 
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#2
04-21-2010, 08:09 AM
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Try adding another ground strap from the engine to chassis, if it doesn't make a difference then the cluster OR cluster ground must be the problem.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
04-21-2010, 09:05 AM
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Quote:
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1993 300E, 2.8 M104 .....
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#4
04-21-2010, 10:08 AM
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run a ground from the back of the dashpod to a known ground as well
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#5
04-21-2010, 11:27 PM
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you may not like this answer
I think that the key to your situation lies in a part of your posting - you rebuilt the wiring harness for it yourself because it was crumbling.
Your car is a 1993 so this sounds to me like your engine bay wiring harness has fallen victim to the well-known deterioration of the plastic insulation around the wiring. 1993, 1994 and 1995 Mercedes vehicles were subject to this. I have a 1993 300CE Cabriolet that had to have the engine bay wiring harness replaced last year. It was done at the same time as the head-gasket, largely because my very dependable mechanic told me that it is the best time to do it (he didn't charge me for ANY labor for the wiring harness) AND because he said he wouldn't want to do the head gasket unless I did the wiring at the same time. I sucked it up and put the money into my "baby" and had both done. The insulation becomes so brittle that it begins to flake off of the wire so taht you start to get current crossing over from one circuit to another. Part cost for the wiring harness is around $850-900. I believe that the forum has some DIY instructions on how to do this yourself. Supposed to take a few hours if you take your time and be careful. Best of luck.
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Jay Yambrovich Scotts Valley, CA. 1993 300 CE Cabriolet (A124) 131K miles 1997 C-280 133K miles 2000 BMW R1100RT 69K miles 1989 300 E 216K miles (sold)
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