consistent 20-40mV difference between O2's at WOT - LS1TECH

Log In 


PCM Diagnostics & Tuning HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3
Sponsored by:
Sponsored by:

consistent 20-40mV difference between O2's at WOT

Reply
 
Thread Tools Search this Thread
Old 02-17-2005, 11:35 AM   #1
TECH Fanatic
Thread Starter
iTrader: (1)
 
Join Date: Sep 2003
Location: Laurel, MD
Posts: 1,904
Default consistent 20-40mV difference between O2's at WOT

Yes, I know, they're narroband, bla bla bla, but both averages and just a general impression from looking at the graph, it looks like one bank is leaner than the other (at WOT so it's stable) by about 20mV on average, but with swings usually under 40mV.
Is that normal for 87k mile old O2s to do, or is it a loose header or something?
Any other common causes for such behavior?
Thanks,
Marcin
RedHardSupra is offline   Reply With Quote
Old 02-17-2005, 11:41 AM   #2
TECH Senior Member
 
horist's Avatar
 
Join Date: Nov 2001
Location: Lake Zurich, IL
Posts: 7,036
Default

Could be a lazy O2 sensor ... if you swap them (driver to passenger passenger to driver) and the problem follows the O2 then it's probably a lazy O2 sensor

but if the problem stays on that bank , could be an exhaust leak around the collector, or at the head, could be a failing fuel injector (or clogged)
horist is offline   Reply With Quote
Old 02-17-2005, 02:33 PM   #3
Moderator
iTrader: (11)
 
jimmyblue's Avatar
 
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,539
Default

It takes only a little EGT (exhaust gas temperature)
difference side-side to make that much output voltage
deflection, at the lower AFRs. More influence from
that than from actual mixture difference, out on the
flat top of the curve. Especially on LT headers with the
large side-side differences in O2 position and cooling
possible, I'd call this a thing not to waste time chasing.
jimmyblue is online now   Reply With Quote
Old 02-17-2005, 06:32 PM   #4
TECH Addict
 
Another_User's Avatar
 
Join Date: Feb 2004
Posts: 2,826
Default

Quote:
Originally Posted by jimmyblue
It takes only a little EGT (exhaust gas temperature)
difference side-side to make that much output voltage
deflection, at the lower AFRs. More influence from
that than from actual mixture difference, out on the
flat top of the curve. Especially on LT headers with the
large side-side differences in O2 position and cooling
possible, I'd call this a thing not to waste time chasing.
Agreed. I stopped chasing that ghost when I swapped my sensors side to side and saw the same difference in mv as before. The difference did not follow the sensor, it stayed on the same side.
Another_User is offline   Reply With Quote
Reply


Tags
banks, difference, lazy, ls1tech, o2, o2s, sensor, wot

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 11:22 PM.