I'm pretty sure it is the black wire (at the sensor). I tapped mine in down
there by the actual sensor - no cutting just used a piggy-back connector. and
yes it oscillates (bounces back and forth between lean and rich) almost ALL the
time. Thats why I keep insisting that you are in closed-loop 95+ percent of the
time (maybe even 99+ percent). This is normal as the computer's strategy is to
keep emissions under control ALL of the time. It will start out kinda slow but
within about a minute - it should speed up (even at idle). Under light to
moderate acceleration - it will bounce very rapidly. The average should be
around 0.45V which represents a stoichimetric mixture (14.7 to 1) which is
neither rich nor lean (as indicated on the gauge). You will notice that it
tends to average towards the rich side as this is the conservative "overly-rich"
enrichment kicking in. And you will also notice how it lays down on the rich
side under accel pedal "stabs" - this is due to the "overly-rich" table lookups
during the VERY short duration open-loop control modes - think of it as being
equivalent to a carb's "pump shot". I believe that Bernd's IAT adjuster even
has the ability to control this averaging - yes, even while in closed loop. It
obviously has the ability to modify the results of the table-looked-up
pulsewidths during those short duration open-loop modes. I assert that this
must be true - how else could you explain everyone's "positive" results when
using it? And no I don't have one (IAT adjuster)......yet 8).
Latr,
Shane
Chuck Robbins wrote:
> Jon,
>
> Thanks for the input. I was wondering something, though. I realized that
> the wires by the O2 sensor were shielded so I decided to tie into closer to
> the PCM. I found the dark green/pink wire, but in looking at the FSM again,
> it looked like that wire was for the heater element.
> I then saw the orange/tan wire going to the PCM in the diagram so I
> tapped into this one. I know that these gauges jump around, but mine goes
> from one end to the other (while the engine is cold) and it doesn't make any
> difference as far as throttle or IAT adjuster settings. Am I just not giving
> it enough time to get into closed loop or did I tap into the wrong wire?
> Does yours continually jump from one end to the other regardless of open vs.
> closed loop?
>
> Thanks again,
>
> Chuck Robbins
> '99 Dakota Sport
> www.intense99dak.com
>
> > Chuck,
> >
> > Yes, you want the upstream sensor. I believe you want the grey wire.
> > (the white ones are for the heating element, I definitely know you don't
> > want either of those) the black would be the ground. (I think... I
> > don't recall if the black was ground or if the grey was ground.) If
> > your FSM says its a dark green wire with a pink stripe, pull some of the
> > protective covering back at the O2 sensor plug, find that wire, then see
> > wether it corresponds to the black or the grey wire. An alternative is
> > to tie into the signal wire in the engine bay. Just find the proper wire
> > (would seem to be the dark green/pink one) going into the PCM and use a
> > crimp tap or something right there. No need to go all the way back to
> > the sensor. (That's how I did it.)
> >
> >
> > -Jon-
> >
> > .--- Jon Steiger ---------- jon@dakota-truck.net or
> jon@jonsteiger.com ---.
> > | Affiliations: AOPA, DoD, EAA, NMA, NRA, SPA, USUA; Rec & UL Pilot -
> SEL |
> > | '92 Ram 150 4x4 V8, '96 Dakota V8, '96 Intruder 1400, '96 FireFly 447
> |
> > `------------------------------------------
> http://www.jonsteiger.com ----'
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