WINDSTAR CODE 171&174 FIX

[GITZY]

I'am Planning On Fixing The Code 171 & 174.after Reading
The Great Thread On This Subject.have A Question What
Gaskets Will I Need.valve Cover,upper Intake.does The Lower
Intake Come Off In This Fix.is That Where The 8 Isolator
Bolts Are.if So Do You Just Take Old Bolts Out And Replace
With New Bolts Without Taking The Lower Intake Off

Thanks Gitzy

[wiswind]

I believe that you do NOT remove the lower intake manifold.
You DO remove the upper intake manifold, to replace the gaskets....

[12Ounce]

wiswind is correct. When I did my '99, I did upper and lower.

But more has been learned since then...and in MOST cases the "lower (aluminum ) intake" manifold-to-head seals/gaskets are NOT the leakers. Usually the leaks are confined to the upper intake manifold (plastic) parts....and usually this means "isolator bolts".

[DRW1000]

I think that the leaks occur between the upper and lower manifold (due to the isolator bolts of course). I think the port seals should be replaced or examined at the very least too. These do not require the removal of the lower however but I don't think the port seals were mentioned in this thread.