[Diy_efi] Post 4-Wire O2 Sensor Swap Observations...

[Gianmarco Rizzo BE/EAS]

i think heater temp control is more typical of WBO2 sensors. the normal narrow band ones are usually constantly powered. in my 2 cars, the ECU doesnt control the O2 sensors, power to the heater is always supplied. sometimes it is supplied only when fuel pump is powered


gm

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> Sent: Donnerstag, 21. April 2005 15:45
> To: Mike Frels; diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...
> 
> 
> I'm not sure about your specific 02 sensor but I thought the 
> "heated" type
> sensors actually controlled the heater to achieve a specific 
> temp at the
> sensing element, a closed loop heater control circuit.  It 
> sounds like your
> installation simply provides battery power without any control?
> 
> If so, the sensor may not be reading correctly and is causing the
> inconsistencies you have noticed.
> 
> Dan Nicoson
> 
> 
> > -----Original Message-----
> > From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org]On
> > Behalf Of Mike Frels
> > Sent: Thursday, April 21, 2005 8:54 AM
> > To: diy_efi at diy-efi.org; gmecm at diy-efi.org; 
> third-gen at lists.f-body.org
> > Subject: [Diy_efi] Post 4-Wire O2 Sensor Swap Observations...
> >
> >
> > About a month ago as part of preparation for my header install I
> > swapped out my single wire O2 sensor for a four wire AFS97 from a
> > fourth gen F-body. I wired the heater in via a relay to hot at
> > all times in the back of the fuse block and grounded via the
> > A.I.R. Port Solenoid ground line. The sensor I gounded to the
> > back of the diver's side head. Since the the swap I noticed two
> > what I consider contradictory results. My BLMs went up between 5
> > and 10 to what were already lean ranges. My idle was around 145
> > before and now it's up to 150. Same approximate changes in all my
> > easy driving ranges. The second nice but puzzling change has been
> > my gas mileage. Previously with my not yet properly tuned Vortec
> > headed 350 I was getting 15-17 mpg for all driving types. Now I
> > get 17-18 mpg stop and go short distance driving and low 20s
> > highway. Why does this not make sense to me?
> >
> > FWI one of the main reasons for wanting to get the headers on
> > before getting the tuning right is tuning ability. In the
> > passenger side collector I have added a bung which will allow me
> > to use a wide band O2 sensor so I can see whats really going on.
> >
> > Mike
> > '86 MAP TPI Z28
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> >
> 
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