I disconnected the F/IC and its o2 sensor tap, removed a bit of insulation on the o2 sensor wire and sensor ground coming from the sensor, started the car, measured the voltage... bouncing. Measured it at the ECU... bouncing. Put the o2 tap on... bouncing. Hooked up the F/IC... bouncing. Put the resistor in... still bouncing. It all works now, there's no more CEL and the power delivery under 4k is much smoother. The only thing I can think of that might be different is there might have been a weak connection in the wiring before. Whatever, it works.

Thanks for the help Joe

I know this is a really old thread, but what resistor did you end up using? 10k?

or if anyone else can tell me what resistor theyre using, that'd be great

The OP was banned for being retarded, so I dont think youll be getting anything out of this thread, but you can keep making consecutive posts anyway.