VERY Low O2s at less than WOT...

[Cakes]

I have another thread posted about my car acting weird and I thought I would ask a different question to hopefully get some help. I noticed today that under boost, 5-15 psi, and not under WOT that my car was not accelerating properly and that my O2 voltage never went above .050 and it hovered around there until I either let off or went to WOT. What does this mean? I was running 17 lbs of boost, 45 psi line off fuel pressure....is my O2 sensor dead? What else could it be? Thanks for your time!

 

[325DR]

At part throttle your O2's are under 100mV according to your scanmaster? Your car is running L E A N for some reason. Check your BLM's and INT numbers (BLM are more important) at partial throttle when this happens. Are they near 128? Or are they at 160? What do your O2's go to at WOT?


Also, how do you know you are #296 of 5512 in the production numbers (in your sig)?

 

[Cakes]

While cruising/idling my O2s are near perfect....they fluctuate between .200-.800 or so. Under WOT they always are around 770-820 after a blast. At Part throttle my BLMS are around 120 or so and when I get into the throttle they go to 140+(cant really say how high since I want to keep my eye on the road under heavy throttle) Its when I go between 5-15 psi and the computre doesnt see WOT that I am having my O2 voltage go way down to .050 or less and it will stay there until I let off the gas or go to WOT. Hope this helps some!

 

[Cakes]

I have done a lot of reading on the site and I have come to the conclusion that my O2 is on its way out. I didnt have a chance to check cross counts under the 5-15 psi situation but I am going to take a guess and assume that they were nill. I hope a new O2 sensor will cure my problem....if not I am only out 35 bucks and I will have a known good one. Thanks and any more help would be greatly appreciated!