RE: ISV Questions, 1988 90q (longish)

[Aleksander Mierzwa <alex@matrix.com.pl>]

Kirby wrote:

	>Last week I was having some routine service done and complained
that my 
	>idle was running at 1200 rpm (warm, w/o AC) and hunting.  My
mechanic du 
	>jour hooked up a digital multimeter into the ISV circuit and
adjusted
	>the %CO screw (in the metering head) until his meter read a
sequence of
	>current values (he said, I didn't check the hookup) that had a
nominal 
	>2.5 mA mean.  He suggested I clean the ISV and reset the
current as 
	>required.  He said, reasonably enough, that the jittering
readout 
	>indicated a properly functioning oxygen sensor.
[...]
	>I haven't found anyplace in my Bentley documenting this
approach to
	>adjusting the %CO.  Has anyone heard of this "shortcut?"  Is it
used
	>perhaps in VW CIS tuning?

I wouldn't trust anyone who adjusts %CO not using an exhaust gas
analyzer. I also doubt if the oxygen sensor has any effect on ISV valve.
That's what the frequency valve is for. I may be wrong, but that's my
opinion.

Alex
-----------------------
Aleksander Mierzwa
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)