pewter02z28gs

one of my 02s is always bouncing around and the other stays constant. when i say bouncing i mean 100 to 840 to 412 to 95 i mean its everywhere i hade this same problem when this car was an ls1 and ive switched 02 so many times its not even funny, also car has differenet harness with the motor swap but same pcm. anyone got any ideas? the o2s are stock bosh z06 o2s for 2002 z06 from when the car hade long tubes, also it does this at wot and normal driving. i should also mention this is an sd tune maf has been removed

pewter02z28gs

no takers huh?

ssduane

iTrader: (3)

process of elimination would lead me to believe there is a wiring issue, bad contacts/ground etc.... since you've swapped sensors.

jimmyblue

iTrader: (11)

Bouncing is normal, stuck is abnormal (except at
WOT, they should stick high (900mV or so)).

Part throttle closed loop, if the O2 is flatlined at
450mV or so it means the PCM has faulted it and
put it there. Could be bullshit tests like heater
performance or insufficient-switching, or could be
a physical (wiring?) fault.

Need to look at what codes may be no-MIL vs
no error reported, etc. and see if there's a tune
setting you could fix to get closed loop working
right.

pewter02z28gs

yeah im always tunning it so ill see what i codes i have no error reported. it still runs good just weird to me but im by no means an expert i just thought that maybe since i switched it to an sd tune it may have affected closed loop but not sure on that though. at wot bank one is 790-825 bank 2 is 825 to 850 but it seems to like it that way. afr comanded it 13.6 but the actual always ends up being 13.2. its made its best numbes there on 100 stock timming. im thinking of bumping the timming a little do to the 241s bump the comp. ratio to 10.7 but im not sure yet as it made 368rwhp and 374 tq with stock everything put a catback and 28 pound z06 injectors hade to adjust the curve a little it was just dumping to much