This book goes into more detail about the fuel injection system than anything else I've seen.

http://www.amazon.com/exec/obidos/tg/detail/-/0837603005

The only place I know of to get the official service CD are the illegal copies sold on eBay. The 126 chassis is a 2-CD set.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino