'86 CGT oxy sensor

[Tony Lum]

At 11:01 PM 10/2/00 -0400, you wrote:
>in '86 audi was using unheated sensors, so it's prolly correct. The extra 
>unused connector you see is the CIS OXS duty cycle for setting the mixture 
>and CO level. Even if you put a 3-wire in, the ECU won't do anything w/ 
>the signal till the thermoswitch triggers. So unless you swapped ecu's 
>too, you wouldn't benefit. The poor mileage is prolly combination of 
>things...bad o2 sensor, spark plugs, fuel filter, fuel injectors, engine 
>compression, vacc. leaks, etc.
>
>try replacing the cheap stuff first and inspect the whole thing 
>carefully...good luck.
>
>-ameer

I've got to disagree here.  My '85 4kcsq has a CIS-E fuel injection system 
with fully heated O2 system.  The O2 sensor is mounted in the cat, quite 
far from the EM so the heated sensor is necessary.  With the smog laws 
getting tougher each year, I can't believe that Audi ever went back to a 1 
wire sensor.  In studying the 1989 Model change info I got recently, 
emissions were getting so tight that even the charcoal cannister had a shut 
off valve and duty cycle valve to admit crankcase ventilation into the IM 
only above 1400 rpm!  The duty cycle connector would be a white nylon 
connector with female contacts laying near or on the right strut tower, 
whereas the O2 sensor will be a 2 pin sealed connector with a wire snap 
lock release, probably at the left rear of the engine.

Regards,



--
Tony
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Tony Lum                                  1987 5000CS Turbo Quattro
Berkeley, California, U.S.A.                1985 4000CS Quattro
Audi Owner/Driver/Mechanic by Necessity ;^)   1980 5000S Sedan
QCUSA Member #6885                             1987.5 Coupe GT
                                                 1983 Ur-quattro
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