Does anybody know how to open a fuel injector connector so that I can replace the wires? It's a 92 400E. I got a special tool, but I can't get the *@#$! ting to open up.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out