G103 Ground (Re)Location

E28 technical advice asked and given! Troubleshooting, modifications and more.
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cardiffkook
Posts: 7
Joined: Jan 23, 2019 2:05 AM
Location: CA

G103 Ground (Re)Location

Post by cardiffkook »

Hi All-

I've been a silent participant for several months and have really enjoyed solving a lot of problems by reading through the different forums/topics. Thanks to everyone for sharing all their knowledge.

I've owned my 88 535is for a couple of months (recently drove from SD to SLO on mainly backroads for the dove opener) and am now getting around to some post-purchase maintenance and cleaning.

So here is my issue...

The engine was swapped in my car before I purchased it. It appears the bolt where G103 is attached to the engine was shaved down (reason unknown). The shop that installed the new motor attached G103 to another place on the engine (photos below).

Is this an appropriate place to bolt G103 to the motor or should it go somewhere else? I am having some cranking issues while starting the motor and some wonky tach issues as well. I figured I would start with cleaning and tightening all the ground straps before diving in deeper. I found the "relocation" of G103 while doing the work.

Thanks in advance.

Overview of G103 location and missing engine attachment
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Close up of missing attachment location
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Current G103 location (drivers side of engine)
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Proposed Location?
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Federico
Posts: 567
Joined: Sep 16, 2013 6:38 PM
Location: Argentina / California

Re: G103 Ground (Re)Location

Post by Federico »

Earlier M30's have the injector grounds right where you have them now; I wouldn't worry about it.
Also if you are still dubious about the engine being grounded properly, you can always attach a new wire between the block and battery negative.
cardiffkook
Posts: 7
Joined: Jan 23, 2019 2:05 AM
Location: CA

Re: G103 Ground (Re)Location

Post by cardiffkook »

Great. Thanks for the info and suggestion. I haven't gotten around to cleaning the engine mount ground strap yet. If the problems still persist, I will add the additional ground.
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