mc_marto said:
Can you post a link to that thread? If you look closely at the plastic connector you'll see the letters. They should be both on the sensor side of the connector and on the other one. And, pin A is actually the ground for the o2 sensor, so if you run an extra ground you'd want to run it to pin A, not B. You are correct about splicing in, soldering, and then connecting the wire to a good known ground. However, you need to make sure you splice into the correct wire. Like I mentioned, pin B is the signal wire to the PCM, and pin A is ground. It's usually tan color by the way. To make sure you see the proper one, follow the wire coming from the outer side of the o2 sensor to the connector, then see what the corresponding pin letter it is on the connector, and what color wire is on the other side.
Cool cool. I replaced my O2 sensor last night. Original one had a blue and white cable. Replacement acdelco one had brown and white cables. Old O2 was the honeycombish style while the new one was a solid piece. Thought it'd be easier to get to than it was
Here's a pic of the old one. Looks whitish which might suggest a lean condition? Which goes against the car almost always reading that it's running rich.
With the new O2 I've noticed a way better idle and overall power. It's as if the a/f mixture mapping is finally spot on so the car doesn't hesitate when decelerating anymore.
At first with the new sensor the idle jumped around about but I went to top off the tank and while I did I unplugged the battery to reset the comp. did and idle learn after and since then all is well.
I have noticed my O2 cross counts still go to 0 every once in a while. So I'm not sure what's up with that. With the old sensor as soon as I get off the throttle it'd go to and stay at 0. This new one will do that sometimes. Other times it'll stay around 5-10 on decel.
I think replacing the sensor definitely helped but I'm concerned that the crosscounts still go to 0 occasionally and also that my integrator and block learn values (p.1.8 and p.2.0 respectively) are occasionally lower than 128 (sometimes as low as 100ish.)
Again with the new sensor, this is happening less dramatically than the old one. I could get the old one to read 80 at idle or decel easily.
Could my MAP affect this?? Should I try to manually ground the O2 sensor just as a preventative test/step to rule that out??
(I'm okay with throwing parts at it within reason. I'll probably put a new MAP on just because. My goal is to really find out what's causing this) i know it could be injectors and I still need to get gear to ohm them out...they all click steadily.
----------
Article link:
http://www.cadillacforums.com/forums/cadillac-forum/t-35837.html
Old 02 sensor:
