Where can you find a 1993 Subaru Legacy engine diagram?
There is a Haynes Repair Manual for this car, the book has wiring diagrams and repair and rebuild instructions for Subaru Legacy and Legacy Outback and Brighton from 1990 to 1998. The ISBN for this book is 1563923262 i picked mine up for US$15 several in 2003.
The book is still in-print and you can routinely find it on eBay.com\half.com for under US$10 shipped. There are people seeling it for over $25 buck online but the book retails at pepboys an advance auto for about US$17(2007/12).
Best Of Luck the 2.2L Subaru Boxer is a solid engine.