I recently replaced the ISV because when plugged in it would cause my
idle to rise by about 200 RPM.  It seems that its static position when
powered was such that it would allow a steady vacuum leak.  Also, when
revving the engine I could still feel vacuum getting by, which means
even with idle switch off, it bypassed some vacuum.

2009/10/23, Rico Dagastino <Dagbear@aol.com>:
> If my understanding of the operation of the Idle Stabilizer control unit is
>  correct, that unit is in control of the idle only when the throttle
> position  switch under the throttle body indicates a closed throttle.  The
> engine
> continues to operate at high RPMs even when the throttle linkage is moved
> so as  to cause the switch to tell the Idle Stabilizer Control unit that the
> engine is  no longer at idle.  After the throttle is engaged control of the
> engine  switches to the ECU.  If this is not correct I would appreciate
> anyone who  could help me understand the process better.  I have been doing
> some
>  reading in the Bentley manual as well as referencing the information
> available  online and this is a good digest of how I think the system works.
>  The
>  engine speed remains high even when the throttle is slightly engaged, I
> may not  have made this clear in my first post.  I was a little tired when I
> wrote  it.  Thanks, Rico
>
>
> In a message dated 10/23/2009 12:57:59 A.M. Central Daylight Time,
> billyandmelinda@CENTURYTEL.NET writes:
>
> Replaced  Idle Stabilizer Control Unit.  Problem solved.  (No more  blinking
> temp light either.)
> Thanks to Zoltan for helping me with  this!
>
> Melinda
> Haleyville,  AL
> KE4FRP
>

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Chris S.
Disclaimer: "Death and serious injury may occur"