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#1
11-01-2020, 01:53 PM
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Rebuilding m103 fuel distributor tool info
Hey guys, on my journey to restore my 260e I have come to fuel system.
Here is the problem with my car, on a cold morning I just have to tap the key it fires up no problem, but if I don’t let it warm up for awhile the first time I try to take off from a stop sign, the car doesn’t react to giving it gas for a second then BAM! It takes off, almost feels like it’s winding up but not reving. I have replaced all of the following with the nicest quality parts I can get -plug and wires -cap and rotor -O2 sensor -fuel filter and air filter -temp sensor for injection system As well as the car has been swapped To a manual transmission so it isn’t the transmission slipping. And the car does run better once warm, but does have a slight surging idle and I’d really like t get it as smooth as possible So that’s why I have landed on rebuilding the fuel distributor. I have seen countless videos on rebuilding it, and have zero hesitation on that, but I can’t seem to find info on where the fuel pressure tool hooks up and what stock levels should be. If anyone can link a video, or a write up or just info on the steps to dialing it in once it’s been rebuilt. Sent from my iPhone using Tapatalk
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1989 Mercedes 260e 1972 GMC shorty van 1982 Harley Davidson Ironhead 
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#3
11-01-2020, 02:49 PM
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I went out and bought a multimeter that had the function Hz% but of it isn’t reading any Hz in any range on the #3 pin so I’m gonna exchange it thinking it has a malfunction. But I will be testing that. I also replaced the fuel injector seals and thinking of replacing the boot on the bottom to rule out any vacuum leaks that could be causing the slight surge idle as well as the tiny brass fitting/ filter on the side just for peace of mind, maybe swap the injectors for new Bosch ones as well. My plan was to get a donor one from a junkyard car and try and rebuild that one so if I fail my car is still drivable as it’s my daily. Has anyone had theirs built by that shop in the south? I have heard good things but I really enjoy doing thing myself. But if they aren’t expensive maybe just trust someone who knows what they are doing would be best Sent from my iPhone using Tapatalk
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1989 Mercedes 260e 1972 GMC shorty van 1982 Harley Davidson Ironhead
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#5
11-01-2020, 04:26 PM
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 Thanks for the info, just checked and wires facing up. Sent from my iPhone using Tapatalk
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1989 Mercedes 260e 1972 GMC shorty van 1982 Harley Davidson Ironhead
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#6
11-01-2020, 08:19 PM
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Rebuilding m103 fuel distributor tool info
So I got a can’t get a good reading to save my life. With the car warmed up, key on but not running, I have black in pin 3 and red in to pin 2. I have a 85% reading.
But once running it goes to 0% If I swap the leads I get a 99.7% Any ideas? Sent from my iPhone using Tapatalk
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1989 Mercedes 260e 1972 GMC shorty van 1982 Harley Davidson Ironhead Last edited by Zacharyrip; 11-01-2020 at 08:31 PM.
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#7
11-01-2020, 10:52 PM
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I posted this problem on benzworld and a guy in there came in with the solution Turns out my car needed to be put in diagnostic mode(possibly being a California car), going to the battery and where you would read codes there is a button that you press and hold for a second a couple times until the light next to it comes on, once that light came on the multi meter read correct at 18.7, I adjusted it to 50 (+/- a couple) and it’s much better. Hope this helps someone as it did me
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1989 Mercedes 260e 1972 GMC shorty van 1982 Harley Davidson Ironhead
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