Originally posted by TSIN03SE:
Originally posted by warmonger:

The electrical ones preserve the shape of the signal oscillation but just drop the voltage and amplitude of the waves.

For as good as they are, I think that soldering a 1uF cap in parallel with the sensor signal wires and a 1 megaOhm resistor in series with the signal wire is very easy.



I believe the circuit changes the shape of the O2 sensor output. It's basically a low pass filter so a square wave input will come out as a rounded off triangle wave albeit lower amplitude and less peak-to-peak. This fools the computer to think the O2 is working correctly.

BTW, I've confirmed that lighting MIL does not enrichen the fuel/air ratio. The blinking MIL however is another story.



It isn't a square wave to start with. It is generated by the O2 sensor and looks like a sign wave. WT heck told you it was a square wave? It in no way looks like a triangle wave with the MIL eliminators on and so far it appears that it is the lower mean voltage and lower amplitude that tells the pcm it is "leaner".

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black