How consistent are stock EGO sensors?

[Orin Eman]

> I know that they are not terribly accurate for getting exact A/F
> measurements, but I bought 4 sensors the same day, and installed
> them on the four output ports (about 3" down from the engine.  A
> typical line of readings are:

>    0x90  0x92  0x80 0x92 (forgive the hex.... these are
> arbitrary, 0x70 is "stoich")

> Does this mean that Cyl #3 is getting more air than the others (&
> therefore needs more fuel, or needs to have its intake reworked),
> or is this pretty much expected from ordinary $20 "universal
> oxygen sensors"?

Try swapping the sensors and see if you get different results...

Orin.