RE: To Clean or not to clean the ISV

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <000501be4ee8$79313600$b06ac8cc@WWICS.wwics.com> "Dan Sinclair" writes:

> Okay, we're getting mixed advice here Phil.  I have a persistent, yet
> intermittent idle issue on my 1988 Audi 90.  I've posted it before.  When I
> decel to a stop with the clutch in, every 6th or 8th time the engine will
> slow to 400 RPM and loaf it's way back to idle.  2 shops have checked it
> out, adjusted the potentiometer etc. and have been able to make it slow to
> 600 rather than 400 (or dead as sometimes resulted).
>
> Someone on the list suggested that I pull the ISV and shoot liberal
> quantities of carb cleaner through it - are you now saying this is not a
> good idea?

No, intermittent idle counts as a 'damn good reason'.  We were
discussing cleaning ISVs on engines without symptoms.  IME ISVs don't
like being messed with.

I believe I now understand the comments about 'not poking anything' into
them - I suspect the seal is bonded or glued to the circumference of
the plunger.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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