Question. Could a faulty front O2 sensor cause misfires at idle? Here's my reasoning:
Because I got SD Headers, I had to extend my front O2 sensor. Instead of being intelligent and buying an extension from ZZP, I thought i would solder in an extension myself. Well, the wires are steel, so soldering wasn't gonna happen. Instead, I twisted the wire pairs as tight as I could, lubed them up with some dilectric grease on the outside, and heat shrinked them shut. Yes, rigged as ****.
Now I am thinking the O2 sensor is giving an artificially low reading because of the added line resistance, which is telling the PCM that the car is running rich. As a result, the car is leaning out the mixture, causing misfires at idle when the car is in open loop. When I drive, the car goes to closed loop, disregarding the O2 sensor. As a result, absolutely no misfires.
I will try replacing the O2 sensor next if misfires at idle can be a result of a faulty one.
