So finally checked the car with an OBD scanner. It was a $380 tool I used from a friend and was fantastic! Everything was normal except for the O2 readings, which I couldn't figure out. Of course they fluctuated a tad bit, but this was pretty much what they stayed at:

One bank: 44
The other bank: 124

Unfortunately, I have no idea which bank the number goes to, I just know they are for the two different banks. What do you guys think? What is normal? Is it a bad O2 sensor?

 

In closed loop, the O2 sensor readings should be switching back and forth rapidly, over a wide range. That means you will see them varying from 0xx millvolts to 9xx millivolts. Each bank is controlled independantly, so there is no significance in the fact that the readings on both banks are not the same.

The only time O2 readings will normally be "fixed" would be on cold start while the PCM is operating in open loop for the first 3 to 4 minutes. With a cold start/cold sensor, and the AIR pump in place and operating, the readings will start at about 450mV, drop gradually to 0xxmV as they reach operating temperature, the PCM will go into closed loop, and they will start to cycle rapidly. Additionally, when you put the accel pedal to the floor, the PCM will go into power enrichment (PE) mode, and the O2 sensors will see the rich mixture that the PCM provides for power, and can stay in the range of 850-950mV.

 

Whew, okay great. Thanks! Moving on to injector cleaning and fuel pump replacement......

 

Does the scanner have the ability to store a log of the operating data over a long period of time? That's the best way to evaluate the data.

Additionally, read this:

http://www.injuneer.com/ScanMast.html

 

As usual, great resources. Thanks Fred! It does, but it wasn't mine. I will try to get it back on it sometime.