I have my APEXi S-AFC blue wire, hooked to my first o2 sensor. I go to sensore check, watch the voltage on #2, the thing jumps from .001 to 1.00 and every number in between. I know the voltage isnt a great way to monitor the o2 but this is impossible...
See ya

I think that sounds right. To use the AFC to monitor the O2 sensor, you need to take readings at WOT (wide open throtle).
g

The voltage at Idle should jump around,if it's running like .1 to .2 solid at idle it's to lean. At wide open throttle while accelerating it should try to stay around .9 to .94 for a good even fuel burn.

Is this true? .9s at WOT? every other post I've read says .85 to .87...what gives?
And is it the higher the value...the leaner? or the other way around?

When u mentioned WOT, can you be in neutral or the car must be going to get the reading?

Does anybody knows how to setting S-AFC in Impreza RS2.5 year 2000, I am setting S-AFC in Pressure 07 sensor(is it ok?) and I don't know the HI-Thrtl and LO-Thrtl setting,can someone give me some advice?

thanks a lot.....

Tony_Chen