More then likely it is your cam phazers these are a trouble spot on these engines
Usually injector seals on these engines, Unfortunately you will need to change injector pipes as well.
The 2004 Ford Taurus has a V6 engine.
The 2004 Ford Mustang has a V6 engine.
The 2004 Ford Expedition has a V8 engine.
The 2004 Ford Explorer has a V6 engine.
The 2004 Ford Focus has an inline 4 engine.
The 2004 Ford F-150 has a V8 engine.
The 2004 Ford Escape has an inline 4 engine.
hey man i got a 2000 mercury cougar v6 it is makeing a tapping noise under my manifold, and i dont know what that could be. but it sounds like you might be haveing the same problem im haveing. suggestion: try checking where that tapping noise was again, it might be under your manifold!.
The 2004 Ford Escape has a 2.0 L base engine size.
The 2004 Ford Expedition has a 4.6 L base engine size.
The 2004 Ford Explorer has a 4.0 L base engine size.