still more 90tq advice needed, Re: still more 90tq advice needed

[ed armstrong]

Huw,

I thinking the same now. The first thing I'm gonna do
is move the 02 sensor to the downpipe location. It may
be sending a rich signal in its current location as
you suggest.


--- Huw Powell <human747 at attbi.com> wrote:
>
> > Thinking about the O2 sensor, I'm wondering if I
> > should use the location on the exhaust downpipe
> > instead of on the cat where the stock 90q location
> is.
> > Currently only 2/3 of the exhuast is going through
> cat
> > (big leak before). Where do you 90tq guys measure
> O2,
> > at the cat or downpipe ?
>
> Maybe you just pointed out a big issue.  If you have
> leakage before the
> OXS, air could be getting into the stream being
> measured, correct?  That
> would give the OXS some O2 to sniff, and I think
> that makes it think...
> "lean" - and try to make the mixture richer.  Maybe
> as rich as it can
> get it, since it can't get rid of that air leak.
>
> Before trying to tune and get the car running right,
> the OXS has to be
> "sealed up" in a sense as an integral part of the
> engine system, ie the
> only thing it should "see" is exhaust, exactly as
> the engine is
> producing it.
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/
>
> http://www.humanthoughts.org/


=====
-ed

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