[T3] lean or rich

Mike Fisher fisherfarms at gmail.com
Sat May 6 05:23:06 PDT 2017


We have my '69 FI/AT square running @ around 12.75 AFR on premium fuel, by
adjusting the Manifold Pressure Sensor.  I'm more worried about prolonging
the engines life than gas mileage!

On Fri, May 5, 2017 at 7:49 PM, Daniel Nohejl <d.nohejl at gmail.com> wrote:

> My understanding (and this is only based on 5 years rather than 40 years
> of experience) is that all that the FI parts should match in letter. The
> only part in my “B” system that doesn’t have a “B” suffix is the TPS which
> is still an “A”. I’ve only handled 5 or 10 of the 2 pin ones, but they’ve
> all been “A”. I also gather that full load enrichment is integrated into
> the pressure sensor on everything after the “B” system. If you’re running a
> “B” MPS with a later TPS and ECU then all might not be well under load.
>
> In your first message, you referred to idle AFR, but now you say you “took
> the old pressure sensor and dialed it in at 12.75" and that the “volts ad
> idle at 13-7,8”. Not sure what the correlation is between AFR and voltage
> here.
>
>
>
>
>
> > On May 5, 2017, at 9:17 PM, KENNETH ROGERS <kensue356 at cableone.net>
> wrote:
> >
> > Daniel,
> >
> > I took the old pressure sensor and dialed it in at 12.75 . I had to
> adjust idle a bit also to compensate. Seams to run real smooth. no drop
> below 850 in rpms while revving coming back to idle. No shakes, heart
> murmurs, no stalls. Never goes into lean, only goes into rich then back to
> idle. Idle is at around 825 rpms and volts ad idle at 13-7,8. Revving
> voltage goes to 14.01 This car is an automatic. Thanks Daniel.
> >
> > Ken
> >
> > --
> >
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