Yes, they are DIYable, but you need line (flarenut) wrenches for sure.

You also need hex or torx (depends) drivers.

DIY without proper tools is dumb. All you can save on is labor--you still need the same tools the pros use, or you'll tear stuff up.

Access is limited on some injectors and removal of fuel lines is required. In addition, same limited access increases liklihood of stipping out allen socket on holddown screws.

There are insulater plus seal on the M103 engine that's in your '88.

I think L-Jetronic better than K-Jetronic, but the latter's injectors sure are cheap in comparison.

There's really no need for intructions, as it's simply unfasten/refasten. Don't bend the lines and don't overtighten them.

The instruction on your CD is 07.3-6520, "Removing and Installing Injection Valves."

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles