Re: '91 200q temp/O2 sensor

["Paul C. Waterloo" <74543.407@compuserve.com>]

>Second; the car just doesn't run right, and no one until now has
>had any success diagnosing the problems (I've ceased hoping its
>only one thing).

>Test; Went right for the O2 sensor with one of those Fluke
>meters you guys talk about.  The meter has a guage that gave a
>readout on a bar graph that showed the O2 cycling voltage up and
>down.  Conclusion...slow O2 sensor is causing computer to
>mismanage the system.  Instead of quickly cycling in a medium
>range of possible voltages, this one slowly seemed to oscillate
>from one extreme to the other.

>Perhaps the experts on the list could comment or add specifics-I
>would if I could.  The suggestion was to replace the O2 with a
>generic Bosch 3 wire O2. The wires will have to be spliced, but
>apparently the one he uses for certain Volvos is the same except
>for the connectors.

Steve-

After I got my 200q last year, it started surging with no change in the gas
pedal setting. Sometimes it was worse than others.

I troubleshot the O2 sensor with my multi meter, got similiar readings to what
you have posted. I think the swings were from as low as 200 mv to as much as 1.2
mv. This is indication that the O2 sensor is worn out and overcompensating.

I bought a 3 wire O2 sensor from Graydon Stucky (on the list) for about $80, had
to cut the wires on my old one and solder on the new ones. Solved the problem
immediately.

Words of wisdom, if you do splice it in, either have a very high wattage
soldering iron and some good heat shrink, or get some very high quality wire
connectors that can be crimped. I used my standard soldering iron, it never
really got the wire hot enough to have the solder flow as I would like, or as it
should for a good joint.....don't want a cold solder.

Paul

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Paul Waterloo
Riverside, IL

91 200q

EMAIL: 74543.407@compuserve.com
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