[V8] O2 Sensor Readings

[Scott Simmons]

Can someone interpret these readings for me?

To induce a lean condition, I pulled the vacuum hose off the FPR*.  To 
induce a rich condition, I plugged the FPR's vacuum hose and/or sprayed 
some carb & choke cleaner into the hose (it was the only thing flammable 
I had, besides electronic contact cleaner.. which I sprayed too).

First run, cold engine
Idle:  0.01 - 0.03 VDC
1000 rpm:   0.02 - 0. 03 VDC
2000 rpm:   0.23 - 0.28 VDC
3000 rpm:   0.29 - 0.35 VDC 
2500 Lean:  0.22 - 0.25 VDC*
2500 Rich:   0.23 - 0.25 VDC

Second run, hot engine
Idle:  0.4 - 0.5 VDC
Idle Lean:  Very sluggish drop from 0.5 to 0.19* (sluggish meaning it 
took 3-6 seconds)
2500 rpm:  0.51 - 0.52
2500 Lean: 0.52*
2500 Rich: Sluggish rise to 0.66

* - in the end, the lean condition from the vacuum hose could have been 
offset by the excess fuel dumped by the FPR

After the first run, I thought I'd nailed it.  A "lean" signal from the 
sensor resulting in excess fuel being dumped which would explain my poor 
mileage (8-10 city) and flutter/miss at idle on occasion.  But the 
second run numbers look pretty good.  The lean condition at idle did go 
down to the correct numbers, albeit sluggish.  The Lean 2500rpm can't be 
trusted, IMO.

The only thing pointing to a bad sensor is the sluggish changes.  Should 
I go ahead and replace the sensor or wait until my second-hand laptop 
arrives for VAGCOM?  Sensor replacement was going to be a Ford but I 
haven't decided on 3 or 4 wire.  Is 4 wire more trouble than its worth?

One last question:  How long is the sensor wiring?  Mine comes up from 
the sensor, zip-tied to the transmission tube, then it loops to the 
shock tower (zip-tied to the brake line brackets) before going back 
under the distributor and plugging in.  Is this OE?

Thanks,
Scott S.