[s-cars] Pressure Test

[mlp qwest]

Ed -

? "An adapter...."  Singular?

I may be missing something here, but what, if anything, do you do to keep
air from leaking past the throttle body or ISV, into the intake manifold and
from there, I presume, out one or more of the five cylinders with an open
valve or two? Or worse, into a cylinder that may have its exhaust valves
closed, and past the rings?  There may be some things you really don't want
to find out about, yet....  :-).

Do you hear, see or feel any air coming out the tailpipe or up through the
crankcase?  Or, are we doing this thinking the throttle body butterfly plate
& ISV valve are pretty air tight?  The ISV hose may be small enough that you
can "pinch" it off with a pair of long nose vice grips, but the throttle
body hose....?  I think you need to pull it off the intake manifold & plug
it off as well.

My guess is, if you have a hole or a crack, 3.5 psi is the threshold
pressure required to hold it open enough to cause the leak to be noticeable.

I think maybe you need an air compressor mit tank and a pressure regulator
which can  be set to put in and then (try) to "hold" pressure at a 15+ psi
level while you look for the source of the hissing sounds.  Sealing off the
intake should take your ECU pressure sensor out of harms way as well.

Mikey

~-----Original Message-----
~On Behalf Of Ed Walsh
~
~Some may know, ad nauseum, that I have been trying to
~fix a lower than expected max boost issue.

....
~
~I made an adapter out of a 3" male sewer clean-out cap
~(great tip!), for the hose that attaches to the MAF.
~I installed an air compressor quick connect adapter
~thru the cap.  All is air tight.  Here is what I did
~the perform the test, tell me if I am doing this
~righto:
~
~
~Thanks a Million,  Ed
~