So my car been running really bad, felt like the one bank would cut out on me almost. Seems to be an O2 as others posted. While it was on my uncle's computer though, I wrote down some readings that I wasnt sure about besides the O2's ...

WHAT ARE the BLM readings? I dont know what this is. But mine read ...
Left BLM 125 Right BLM 108, at idle, pretty hot but still in open loop cause of the O2's. Is this normal/ok also?

And my ? about Spark advance ... at a 900RPM idle ( M6, open loop still cause of O2, but hot engine) was 21*. Spark advance at a 3500RPM rev was 37*. Is this normal, where they should be, or is something not right? Could it be because of my bad O2 that im changing tommorow ???

 

BLM's are the learned "long term" fuel corrections. BLM stands for "block learn multipliers". The PCM divides the learned BLM (e.g. your values of 125 or 108 - probably for idle cell 16) by 128 to determine the fuel to be added or subtracted from the "standard" calculation. The O2 sensors have told the PCM that the standard calculation isn't working and that it either needs to "add" fuel/pulse width to richen up the mixture (BLM greater than 128), or "subtract" fuel to lean the mixture out (BLM's under 128).

Your numbers suggest that the right bank of the engine would be running excessively rich, but the PCM has subtracted about 15% from the normal fuel calculation to compensate. You have some sort of problem on the right side of the engine. It may be a fualty O2 sensor, or it could be an internal engine problem that is causing the right O2 sensor to see a rich mixture.

The normal spark advance at idle for an M6 is in the range of 18-21deg, so yours seems OK. When you rev the engine, the PCM needs to increase the advance, to start the combustion process earlier in the compression stroke.... again, yours seems normal.

You might want to read parts of my online scanner guide... all of this is explained in there:

http://members.aol.com/InjuneerZZ/ScanMast.htm