A little background: I bought a '71 Pontiac LeMans with a LQ4/4L80E swap that was 95% complete. The engine has LS3 heads, a rectangle port truck intake with cable throttle body, and a mild low end cam. The previous owner flashed the PCM with a mail-order base tune just to get it running and unfortunately I don't have a copy of the stock tune to work with. The engine/trans/PCM came out of a 2005 Chevy Express, PCM is a P01 (blue). The tune is set up as a MAF delete SD only, which is fine with me but I'm having trouble getting it into closed loop. Fuel System #1 Status always reads "OL - Not Ready" and the O2 signals hover around 450mV on both banks.
I've verified 12V and ground to the heater circuits and flame tested both sensors (they look new - not sure of the brand). The heater circuit resistance on both was between 16-18 ohms, which seems a little on the high side, but not out of range according to the info I can find. The high/low signal wires appear to be pinned correctly at the PCM, but I haven't had time to check continuity between the PCM and sensors. Before I start tearing things apart too much, I just want to make sure there isn't something in the tune that could be causing it to ignore the sensors. Latest tune and log are below:
009 - Set Closed Loop Temp.hpt
22-08-11 18-10-00.hpl
Any help would be much appreciated - I'm new to tuning and just trying to learn as much as possible.