consistent 20-40mV difference between O2's at WOT
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
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
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
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)
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)
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.
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.
TECH Addict
Joined: Feb 2004
Posts: 2,826
Likes: 0
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.
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.
