Have been working on the moving duty cycle now for over a week. I just can't seem to find that sweet spot. It either drops to .09v or raises to 12.7v. The difference is no more that a click of a turn in the adjustment screw. I got it to hold between 6.9 and 8.5v for about a minute. While it was like that, I checked the O2 sensor. It seemed to be functioning, sweeping up and down in voltage. But after a little more than a minute, voltage dropped as before, setting at .09v on both the lamba reading and O2 sensor. After adjusting it clockwise a click, the readings eventually went back to 12.7v on lamba and .84v at the O2.

Going back to make sure I hadn't missed something, I rechecked the throttle position switch. The reading between post 1 and 3 seem correct, but the reading for post 2 and 3, show open no matter what the throttle is at. I get this same reading from both the original switch and the replacement one. That seems wrong to me. The readings for the air flow sensor seem to be within spec. I also checked the idle control valve just to be sure, and it seemed to be working.

Last week, I had to take the car to get gas. On the way, after about a mile, the check engine light came on. Checking codes it showed a 17 indicating O2 sensor. I assume this is because of fouling from running so rich. My question to this is, does this mean I need to replace this O2 sensor again or does it just reset so to speak? The readings from today makes me feel like its working.

To me, this has got to be a sensor or something. It all came on too fast to just be a matter of an adjustment. In open loop, it runs pretty good. Once ECU kicks in, it goes to pot. I haven't checked the coolant temp sensor yet, that's next on my list. Can anyone tell me what the correct readings for this are?