the most common place is under/next to the coil pack. their is a torque bit plug that I believe is the right thread pitch and type that is needed. This is also a port that is often used for oil feed lines for a turbo.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)