The hunt for idle

[abatzis2@hotmail.com (Michael Abatzis)]

bentley tests on the isv can be misleading--electrically, it may work as 
expected (ie current is getting to the right places) but mechanically it may 
not be.  only way that i know to check is to take the front hose off 
(leaving wiring on), turn the ignition on.  while humming, you should be 
able to easily see the valve opening/closing (pretty fast). if not, it needs 
a cleanin'.


>From: Cathy Boyko <losinit@usa.net>
>To: <scirocco-l@scirocco.org>
>Subject: The hunt for idle
>Date: Fri, 21 Jun 2002 20:13:45 -0400
>
>Well, my little car has started seriously hunting to establish a decent 
>idle
>rpm, only when it is hot, say, oil temp above 101*C or so, it goes
>up/down/up/down/up/down, almost as fast as you could say it. Brett 
>suggested
>cleaning out the idle stabilizer valve with carb cleaner, it didn't remove
>that much crud, as if it was fairly clean. Grounds are all new, the small
>vaccuum lines have all been replaced (I think, maybe I missed some that are
>not obvioius?), rubber hoses/boots etc all seem firmly clamped and intact, 
>and
>the idle air bypass screw is new, so it's not the o ring there. It had a 
>good
>dose of injector cleaner run through it not that long ago. I didn't do any
>electrical tests on the ISV, perhaps that is worth checking? It buzzes, as 
>it
>is supposed to, according to the Bentley. So, otherwise the engine revs
>freely, makes good power, and all that stuff. Any ideas? It seems heat 
>related
>for sure. For now I just turn the A/C on, it's long gone but the engine 
>idle
>doesn't know that ;)
>Suggestions are welcome. Cathy
>
>
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