You're in luck. Changing the gaskets in both the upper and lower intake manifold is much easier than any other engine I've worked on.
It will help to get a manual (Haynes is good).
Step 1: Remove the throttle body.
Step 2: Remove the upper plenum. It's held by 8 long thin bolts with 8mm head. The bottom of the upper plenum contains 6 rubber oblong gaskets. The whole set should cost about $20 at an auto parts store, more at the Ford dealer.
Step 3: This part is a bit tricky. There are 16 bolts holding down both the fuel rail and the lower intake manifold. 8 of the screws are long, and 8 are short. Remove ONLY the 8 long screws. That way, the fuel rail and intake manifold can still be one assembly, and you won't have to remove the fuel injectors. Otherwise, you will have the extra step of removing the fuel injectors and replacing the O-rings when you're done. The intake manifold gaskets look like rubber kidneys.
Step 4: Replace gaskets.
Step 5: Reverse the previous steps to reinstall. Torque the manifold bolts to about 90 inch pounds.
Wednesday, September 26th, 2007 AT 6:48 PM