Re: 5KCSTQ: fuel enrichment

[Rolf Mair <waves@epix.net>]

On Mon, 8 May 1995 PDQSHIP@aol.com wrote:

> I'm not referring to O2 directly, I'm referring to the freq valve in the fuel
> dist.....  the turbo motors should read 50% dwell +/- 8%....  A freq valve is
> operates on the same theory as a set of points, you have a open and a closed
> cycle....  The Audi techs don't use any special tool for this setting (at
> least they don't need to), don't make this procedure too complicated, it's
> dwell and the spec in the manual IS a dwell reading, to check full throttle
> you should see about 70-80% dwell.....

I'm not making it complicated! Your method of testing through the frequency 
valve is valid. BUT, understand that the frequency valve is regulated by 
many other factors, sensors included. Therefore, would it not be wiser to 
test by the O2 sensor, which is the final 'word' of how well the engine 
is burning? What if the coolant sensor is faulty? it affects the 
frequency valves performance, as does the O2 sensor. Of course one may 
have a faulty O2 sensor as well, but it is only one variable, not many. I 
still preffer to test via mili-volts thru the O2 sensor, although 
ideally, the picky enthusiast would try both ways, or even use a 5 gas 
analyzer!
r.mair