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Question about ISV plumbing

While changing some ISV hoses yesterday on my NA 10V I-5 type NG engine, I
found that the plastic "L" fitting to which the ISV input hose attaches also
provides a pinhole connection to the intake manifold, at the rear of the
engine.  The location on the intake maniford suggests it connects to the
fuel injection gallery (if there is one).  My question is, what is this for,
some failsafe idle backup in case the ISV becomes blocked?  A means of
passing a tiny amout of air over the rear injector?  An obscure polution
control function?  Any guesses welcome.


                .... Kirby   (Kirby A. Smith)
                              2 x 1988 90q
                          New Hampshire USA