It's a 1.8 ljet . The wire is black coming from the FI harness.
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There is no black wire in the FI harness. You can find the wiring diagram on my harness website. Link in my signature block
black w/purple is tach wire
http://www.pelicanparts.com/914/parts/Electrical/914_electric_74E.jpg
The 1.8 should have the single white wire from the injection to the coil (-) terminal, and I can see it in your picture. There should also be one wire plugged into the coil's (+) terminal. That one goes to the double relay. Perhaps that is your mystery wire?
Check the continuity of that wire before just assuming, though.
Diagram:
http://www.pelicanparts.com/914/parts/Electrical/914_electric_74_AFC-B.jpg
--DD
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