Hello,

This evening after work, out of the blue, I decided to take the fuel distributor and plenum off the M103. This involved by first removing the fuel injector metal lines and then other various fuel connections, a vacuum line, and an electrical connector, etc.

To replace the intake boot, do I need to separate the two halves of the assembly that the fuel distributor sits on? The old boot is pretty stiff and definitely should be replaced. The injectors are original and probably shot, but I will keep them as spares. Should I replace the gasket that the throttle body sits on? What else besides all now easily accessible vacuum lines?

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)

Yes the two parts need to be separated. Take the opportunity to completely clean the plunger ensuring there is no dirt and it depresses without any sort of binding and center the plate.
I also recommend getting as much dirt and debree out of the intake manifold. When you open the throttle valve attached you'll notice a swamp of horror below. Just soak some of it up as best you can.

Some more info and pics here:
http://w124-zone.com/articles.php?article_id=23

With the fuel distrib removed, check your motor mount on that side...it can be accessed 10x easier with it removed.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k