Re: Idle Stabilization Valve (ISV), 88 5K

[Todd Joseph <todd@ConnActivity.ConnActivity.com>]

Your reply-to was wrong in your original mail.  Thought I would follow
up with it right so you'll get any replies.  From my *limited*
understanding you found and cleaned the ISV, but I'll wait to hear
what the experts out here say. 

Todd 
todd@connact.com
--------
>My car has mostly been idling around 1200 rpms.  This is after warm up and
>without A/C.  Took off a gray cylindrical thing with 2 ports to vacuum and
>one electrical connector.  It is on top of the intake manifold, at the
>back.  It was marked:
>
>	BOSCH
>
>	0 280 140 512
>                             
>Made in Germany  (011)  12V
>
>VW  034 133 455B
>
>Cleaned it out with carburetor cleaner.  There seems to be another cylinder
>inside which rotates.  After cleaning, it rotated pretty freely.  
>
>Is this the ISV?  Car seems to idle lower, but I really did not get a
>chance to run it much.  
>
>The car also "jerks" at light throttle - on and off the gas.  This is
>especially pronounced in lower gears in stop and go traffic.  I can also
>feel it to a lesser extent in higher gears at higher speeds.  Maybe some of
>this is driveline "slop", but does the ISV contribute to this?  I thought I
>read something here about the ISV smoothing out the on/off throttle.  What
>does the ISV do?  How much do they cost?  How does one test it?
>