Bad oxygen sensor ?

[Edmond]

I noticed that with the chip I made where I gave it a lot of fuel to
compensate for the supposedly lean condition my MPH on the G-Tech is 98
(yeah I know... pathetic). I took the stock values from 90-100 Kpa  for the
VE table out of the stock chip and pasted them in my bin. Ran at 100mph. I
did at some point get it to go up to 104 mph, but I think that was
accomplished with a little bit less fuel then stock. I'll play with it
tonite.   At part throtle I got it to stay at 128 pretty much and at idle
it's a perfect 128/128 for the integrator and the BLM! Hehe    Car runs
awesome at part throtle and I love it this way. I guess now I just need to
give it what it needs at WOT.


----- Original Message -----
From: "Bruce Plecan" <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Wednesday, November 08, 2000 12:03 PM
Subject: Re: Bad oxygen sensor ?


>
>
> MPH
> G-Tech is one such tuning tool.
> In car DIY timer off of VSS will do for the EE crowd
>
> WB, and EGT tell you about where you are AFR,
> Performance measurements dictate what the engine wants
> Bruce
>
>
> > So what do you tune by if not the o2 sensor ? SOTP ? 1/4 mile times ?
MPH
> at
> > the end of the quarter ?
> >
> > ----- Original Message -----
> > From: <timsiford at hushmail.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Wednesday, November 08, 2000 10:50 AM
> > Subject: Re: Bad oxygen sensor ?
> >
> >
> > > First the standard O2 disclaimer....
> > >
> > > Tuning by O2 voltages can be highly inaccurate.
> > >
> > > With that said ... I would check two things...
> > > 1) Tape a Fuel Pressure guage to your windshield and have a buddy sit
in
> > > the passenger seat as you do a WOT run.  Have him watch the FP guage
> > ESPECIALLY
> > > in 3rd gear to see if your FP is decreasing.
> > > 2) Check your header collectors.  In some cases high speeds can act to
> > force
> > > fresh air into the collectors if they are not tight.  The extra O2
will
> > > register on the O2 sensor.
> > >
> > > Tim
> > >
> > > At Wed, 8 Nov 2000 09:59:08 -0800, "Edmond" <euro at lvcm.com> wrote:
> > >
> > > >
> > > >
> > > >I did several 1/4 mile runs after I installed my Edelbrock headers
and
> > > >=
> > > >brand new o2 sensor. First and second gear are nice smooth 900mV
range
> > > >=
> > > >ramps. Once it hits third gear is starts descending rapidly to about
> > > >=
> > > >400mV and stays down until I let off the throtle. I wish I was at
home
> > > >=
> > > >so I can show you the exact Diacom graph. I tried giving it more fuel
> > > >=
> > > >(almost 95 in the VE tables) between 90-100 KPA but it still does
this.
> > > >=
> > > >The engine runs fairly well at WOT, but I cant really tune it w/out
> > > >=
> > > >gettting some accurate info from the sensor. My old 80K mile o2
sensor
> > > >=
> > > >in the exhaust manifolds didnt do this at all. Could this indicate a
> > > >bad =
> > > >sensor ? I should mention at idle it goes from 40-50 to 800-900
almost
> > > >=
> > > >every 1/2 second. It does this at light cruise too. Maybe it's time
> > > >for =
> > > >a heated sensor ? Still downt explain the WOT weirdness though since
> > > >it =
> > > >should be nice and hot.
> > > >
> > > >
> > > >
> > > >p.s. I know Bruce already answered this on the thirdgen.org message
> > > >=
> > > >board, but I wanted some more opinions :)
> > > >
> > > >
> >
>
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