theformula

I did some "real time" readings with my Auto xray today to capture some data. I noticed my 02 can go from 0 all the way to 963 in a matter of a second. Is this normal? Shouldn't it be stable??? Could it be a bad o2?

------------------
91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 polished kit, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL (5275rpm limit),Holley 9mm wires,Ac delco R43ts plugs,fastchip,Ford SVO 24# injectors,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

GMTech

What you are seeing is a properly operating O2 sensor. Ones that are "lazy" or don't fluctate rapidly are degraded and need replaced.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

JP84Z430HP

Actually, the more it fluctuates the better! You should also have a value calle "Cross Counts", which is how many times the sensor voltage crossed the median voltage of .45v since the last scan data update. This value can SORT OF be used to determine whether an O2 sensor is going bad.

I doind it odd that it fluctuates so far. I would typically expect to see it going from like .25 to .75 or somewhere in that range. I don't know if it's anything to worry about, I am just going by what I normally see.

------------------
Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand.

Starting to look like the Kicker poster child!

ASE Certified Master Tech

mikeage2

i agree!what you are seeing is the computer making the car rich,lean,rich,lean......
its supposed to...its always hunting for that perfect 14.6 parts of air to 1 part of fuel mixture.the more the voltage moves aroud the better off its working

------------------
86 camaro:was a v6 car,now its going to be a v-8 5.7l!!
350:cylinders bored .040 over.a little over 9:1 compression(getting a blower some day when im rich lol)line bored.deck is milled a little(was pitted)
trw forged pistons with summit stage 2 polished rods with arp bolts.
194? intake valves(not 2.02( ),pocket ported,gasket matched,and polished ports,old vette intake with new zinc 650 holley

ase certified for a few years,learned alot though

working on freakin NEONS ,cirruses,tauruses,cobras(well` at least they look nice lol)and intrepids all day makes me drink too much
good job security though

im always on the lookout for cheapv-8 t-5,s
and t-56 setups.they must be cheap.i dont care of they need rebuild,as long as they arent totally blown

Skip Howard

Mine varys around the .45v range only by about .05v. Being that is't got about 125K miles on it I'm sure it's beyond history!

------------------
85T/A 305/QJ work in progress.

[This message has been edited by Skip Howard (edited March 04, 2001).]