Re: high-pitched...frequency valve

[Night Shadow <soltwede@ucsub.colorado.edu>]

Oliver, TRUST us, it is SUPPOSED to buzz, if it dosen't buzz then it isn't
working, and the car will stall (trust me, had a water logged ECU one
time, kept turning off the frequency valve, it was quite annoying.)

The frequency valve on my 8v is a small silver cannister with fuel lines
and an electrical connection on it.  It sits on the shock tower side of
the fuel dist (external of it).

Eric


On Wed, 12 Jan 2000, Oliver Seiler wrote:

> On Tue, 11 Jan 2000, Oliver Seiler wrote:
> 
> > [...]
> > 
> > Not much more information beyond that. The electromechanical nature of it
> > makes me think it could go bad, but there isn't anything on what would
> > happen if it does. I also can't tell if it's serviceable. And I still
> > don't know if the noise is normal. If it's inside the fuel distributor,
> > the only thing to do would be to get a new one, I would think (assuming
> > it's not working properly).
> 
> Found a few interesting links which describe the frequency valve in more
> detail. It's surprising that I don't find a mention of this in Bentley's.
> I guess the question is whether it actually exists or not in the Scirocco
> CIS system (with Lambda). I'll have to actually find it, since it seems to
> exist outside of the fuel distributor itself.
> 
> Links:
> 
> http://www.ncr-pca.org/cis.htm (looks relevant to Scirocco)
> http://www.teleport.com/~scottmo/boost.html (Audi CIS)
> http://24.5.5.58/a2-idle_problems.txt ('84 GTI related)
> 
> Not much else. The last link mentions that the procedure for changing the
> duty cycle on the frequency valve is described in "Raven's book" (I assume
> he means Water-Cooled VW Performance Handbook). Unfortunately I can't find
> a reference to the frequency valve there, although the procedure for
> modifying the idle mixture using the Lambda sensor is possibly what he was
> referring to.
> 
> Anyway, nowhere have I found a mention of a high-frequency buzzing being a
> normal thing, which is what I was originally trying to figure out. And I
> don't know if the frequency valve even exists yet!
> 
> Oh well, great way to learn about the fuel injection system though... :)
> 
> -Oliver
> 
> Oliver Seiler -- Software Developer, Pivotal Software, http://www.pivotal.com
>     Scirocco MkII Diary - http://erisian.com/~oseiler/scirocco/index.html
> 
> 
> 
> 
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