weird o2 behavior

[avido]

Guys we are dealing with something evil in the car. $we changed the camshaft. stage 3 pd from stage 2 to a friend's car. Brian tooley racing. it happens that randomly one of the 2 02 sensors reads 52 mv while the other is 450ish. it could be either one. sometime from left bank sometime right

Also when this happens, the car pulls fuel. we see -20 ltft even when the wideband reads the correct afr. of course when it starts to pull the car becomes lean. Very weird behavior. it happens randomly

any idea?

[07GTS]

if its pegging at 450mv then it sounds like its loosing connection like wiring issue to the 02's

[avido]

No I meant that when this problem happens,one o2 sensor is around 450 but not steady,which is stoich but the other one reads a total different value like 50ish or 60ish. Something like that and it could be either one. Sometimes it's the bank 1 and sometimes the bank 2

[07GTS]

u will have to post up a log of the issue, do u have wideband ? what does that read

[avido]

If in open loop the wideband reads perfect 14,7 once in closed,it reads 17.5 but the fuel trims keep pulling

[07GTS]

is your wideband analogue 0-5v ? sounds like WB may be off and could have a ground offset if its analogue, if 02's are CL and cycling as they do they should be true

[avido]

is your wideband analogue 0-5v ? sounds like WB may be off and could have a ground offset if its analogue, if 02's are CL and cycling as they do they should be true

it's an Aem canbus

[07GTS]

not sure would have to see a log of it too have any idea of something going on