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RE: ISV Questions, 1988 90q (longish)
>Last week I was having some routine service done and complained
>idle was running at 1200 rpm (warm, w/o AC) and hunting. My
>jour hooked up a digital multimeter into the ISV circuit and
>the %CO screw (in the metering head) until his meter read a
>current values (he said, I didn't check the hookup) that had a
>2.5 mA mean. He suggested I clean the ISV and reset the
>required. He said, reasonably enough, that the jittering
>indicated a properly functioning oxygen sensor.
>I haven't found anyplace in my Bentley documenting this
>adjusting the %CO. Has anyone heard of this "shortcut?" Is it
>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
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)