Re: WGFV, LED Tester and WOT Switch

["Douglas Hurst Quebbeman" <dougq@iglou.com>]

> > You could also remove it from the car, and hook a small tube up to it. Apply
> > voltage using a battery or a cigarette lighter accessory thingie. I can't
> > remember if it's open (passing flow) when energized, or when not energized,
> > but one way, you'll be able to blow air through the valve, the other way,
> > air will not pass.
> 
> DO NOT HOOK UP THE WGFV TO 12V.
> 
> If you want to know why, ask Charles Adair.  I think new ones cost
> GBP100 or so.
> 
> I've seen this problem on the VDO idle stabiliser valve and on the
> WGFV.  Just because it's on a car doesn't mean every voltage it sees
> is battery voltage.  The ECU drives some things with 6v and some with
> current rather than voltage - the ISV being a case in point.

I would not have suggested this course with the ISV, as it is not a device I'm
familiar with from my past experience. However (and while I admit I have not
checked the part number), the WGFV looks *identical* to a part which was also
called an electromechanical valve that was used on my carburetted 100LS, and
which was driven on at +12v, off at 0v.

It is also possible that more than one type of device has been used for the
WGFV function, with one being capable of 100% duty cycle, the other not. With 
parts-bin engineering being the method if not the motto, then it makes sense 
that they'd use whatever part was available.

However, I'm betting that since Mark Pollan has the exact same car I do,
that he very likely has the exact same WGFV. But if Phil's certain that
the specific part in question can not be driven at 100%, then don't follow
my advice.

YYMV... -doug q
--
-Douglas Hurst Quebbeman (dougq@iglou.com)       [Call me "Doug"]
    QuattroClub USA# 4536     Audi International # 100024
       74 100LS Auto,     84 Coupe GT 
       77 100LS Auto,     86 5Kcstq QLCC 1.8bar  
"The large print giveth, and the small print taketh away."  -Tom Waits