Oxygen sensor test

[ed armstrong]

--- Danae Kranski <kranski at worldnet.att.net> wrote:
> This is a multi-part message in MIME format.
> --
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> I have been trying to pass the NOx portion of an
> emission test and would
> like a practical way that I could test the O2 sensor
> (3 wire -2 white &
> 1 black) with a digital multimeter if possible. The
> car in question is a
> 1990 80 series Q, 2.3L. I have had a shop test the
> sensor with a scope
> and they said it was working fine.  They also said
> that they enriched
> the mixture on this fuel injection system which I
> have come to find out
> that with the KE-Jetronic system, enrichment is not
> adjustable and is
> control by the ECU automatically.
>
> Suspicious
> Richard
> --
>

Richard,
Your system is CIS-3 and the mixture is adjustable
externally. The CIS computer controls mixture only
within a small range. One can think of the external
adjustment as course and the computer adjustment as
fine.

If you did have high NOx the mixture was too lean so
it would appear the mechanics made the right decision.
Hows CO now. A high CO would indicate the adjustment
went to far rich.


=====
-ed

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