still more 90tq advice needed

[Jim Green]

--- ed armstrong <edshred2000 at yahoo.com> wrote:
> Thanks  Huw, Mike G., Javad, Jay et al. for your
> input.
>
> Looks like I've got some more homework to do. I
> haven't paid much attention to measuring signals
> other
> than timing and rpm (and my nose and ear). I
> actually
> have a special adaptor to measure the current in the
> CIS differential pressure regulator so I'll check
> and
> see what the computer thinks the mixture should be.
> Playin around with the mixture, I been careful to
> count the turns rich or lean like some of you
> suggested.
>
> 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 ?

I have it right after the turbo.  I agree with Javad,
think about it, there is no reason anything mixture
related should have to change.  The only thing you
have technically changed, is that there is a turbo and
intercooler in the intake path, both of which mean
nothing to the CIS system.  Finding these little
things that are hooked up wrong is the biggest PITA on
these CIS conversions.  Reset the mixture back to
where it was, and keep plugging away.

Also check that Idle and WOT switch wiring.  The
pinouts on the switches are different.  I had to
change mine two or three times before I firgured out
the right combo, eventhough each time I swore it was
correct based on testing both switches.  The only code
you want to see is 2232 I think, it has to do with the
airflow plate position not matching up with the RPM's
and other stuff.  That's because of the turbo sucking
more air in than normal.  You may even be able to
avoid this if the boost is kept low.

HTH,


=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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