Finished replacing the upper intake plenum...which had a coolent leak
and the lower intake manifold gasket.
Just wanted to say thanks to all who helped me out with information
including Shep, for recommending autozone.com and jgalianojr....
Also to Dan Brow for helping me locate a factory service manual,
which was a tremendous asset !!!
Took me the better part of a day...replacing both the upper plenum
and also the lower intake manifold gaskets. Still not bad for a novice
considering several parts run for items that needed replacing. With the
knowledge I could do the upper plenum alone in about 4 hours.
I used an OBDI scanner and noted all values before starting.
Kept a video camera around and took pictures on how things
were originally positioned.
Was easy to do once I started. Guess I was reluctant because
the job seemed complex but everything was pretty straightforward.
Upper Manifold Intake Plenum from dealer was $300.00. Gasket
Set was another 35.00 and then the "O" rings for the fuel injectors
cost another $10.
This was a 1994 Vin L . Dorman replacements start at 1996
and the egr valve mod kit is for VIN K engines 1996 and above.
I noticed that on the 1994....VIN L 3800 there doesn't seem
to be an EGR value extending from the lower into the upper.
However the upper plenum did have a pretty fair sized leak
when tested with a pressure tester.. I'm assuming it was
cracked somewhere internally and I couldn't find any external
I couldn't get one quick disconnect fuel line fitting off, no
matter which tools I tried....but was able to twist the fuel
rail out of the way.
All in all, it was a ??? fun ??? learning experience...I wouldn't
hesitate to do it again !!!
Thanks again for the helpful responses.