Low 02 Reading

[Scoobum]

I'm getting a low 02 WOT reading from Dan Kellers car...and it isn't real. 02's are in the mid 600's. No KR. New fuel pump. New hotwire kit. New battery. New alternator. TT chip burned for the exact combination. Fuel pressure rising with boost. 43 line off FP. Tried 2 known good ECM's. Grounds cleaned to within an inch of their lives. New 02 sensor. All SM readings normal. Engine temperature at 170 degrees.
 
Fire away guys...cuz I'm out of ideas.

[Steve Wood]

I have no idea...but, you might go thru the trouble tree here http://www.vortexbuicks-etc.com/code_13.htm to check the continuity, etc.

Does the car go into closed loop?

What are the blms showing?

[Scoobum]

I'll be at Dans tomorrow...and check BLM's and closed loop.

[daveismissing]

Are you sure the knock sensor works?

[motorhead]

What brand(s) of O2?

[gusszgs]

Stock MAF?

[Scoobum]

Stock MAF
BLM's-118
Goes into closed loop
Knock Sensor is working
Denso 02 sensor

[Steve Wood]

so, assuming the maf is reading at least 245 at wot, the ecm is pulling fuel while the O2 sensor is telling it to add fuel?

[Scoobum]

so, assuming the maf is reading at least 245 at wot, the ecm is pulling fuel while the O2 sensor is telling it to add fuel?

Steve...the BLM reading is at idle warmed up. The owner has a PL file at WOT for an entire run. Let me know what readings you want at WOT.

[Steve Wood]

be easier to post the file then we can look at it

[motorhead]

Heated O2 or stock replacement? Cross counts?