Ok i've been trying to install the jaycar mixture meter and i plugged it in for a test run and the lights lit up as normal but after i start to drive, they drop down meaning lean mixture then finally no lights!
So i thought maybe the kit i made is not working properly so i used a multimeter to see what voltage was coming out of the o2 sensor. I cut the o2 sensor cable in two so i could solder on the mixture meter and just twisted thecables together just to test (i'll solder later).
So i'm measuring the voltage at where i twisted the wires back together. On the multimeter the voltage coming out of the o2 sensor is practically zero, but when the car was cold and i switched it on, it read 0.046 then slowly dropped. I've checked the connection where i twisted the wires together and they're pretty secure.
so, could this be a dodgy o2 sensor? Is it possible for it to drop in voltage as it warms up? (it's a 3 wire type).