An observation with $0D mask

[sturgillbd]

I was playing around with O2 switch points vs airflow in the fuel trims. Ive noticed if you move them lets say 100 mV in the low airflow portions of the tables, the PCM will hang in PE mode until you either key off or drop under the minimum MPH for PE. Anyone else successfully moved the O2 switchpoints around much in here and got it to work?

[1BadAction]

Would that maybe be a real deal bug? Programming induced? Interesting for sure.

Doesn't do that with $OE, for anyone wondering.

[sturgillbd]

I noticed I started killing plugs in my jeep after changing heads and putting a bigger cam in it. I started tuning and noticed I was chasing my tail with BLM's. I paid attention to the dash and noticed that once it entered PE, It would stay in PE until I came back to idle and the VE/Spark tables switched to idle. For now I just adjusted the O2 settings for Idle and havent messed with fuel trims any more. Its turned off cold here and I have no top on the jeep. Kinda rough pulling 55 mph plus datalogs and it being in the high 20s and low 30s :) Maybe Fast355 or one of the other $0D gurus will chime in. Thanks for the reply Brian

[ony]

might raise the throttle % up high to turn pe off till you get blm's adjusted.. I had one file steady cruise and for no reason my data log would show blm going to 240 from 124,i guess it was corrupt.

[Fast355]

I was playing around with O2 switch points vs airflow in the fuel trims. Ive noticed if you move them lets say 100 mV in the low airflow portions of the tables, the PCM will hang in PE mode until you either key off or drop under the minimum MPH for PE. Anyone else successfully moved the O2 switchpoints around much in here and got it to work?

Never have seen that problem....Try a different .XDF file and see if something is wrong with the changes you made in the .BIN. Suppose it could be Cat over temp protection.

[sturgillbd]

I had raised the throttle % up during tuning and had re-enabled. Datalogged after that and that is when I noticed after PE was activated, It stayed in. Going to wait for it to warm up some and get it back out and test a few settings and see at what point it gets stuck in PE. I drove it this eve for a bit. I need to be able to target a lower voltage to lean the engine out some at low airflows. (Ie crusing through tow in high gear around 15-20 mph with very light throttle) Brian

[sturgillbd]

I copied tables out of the bin I was working on and started over with a fresh copy of BJYM. It no longer hangs in PE when the O2 voltage threshold vs airflow tables are adjusted. Something had become corrupt I guess. I will do a bin compare and see where it went wrong. It was definitely odd. Did some datalogs and tuning today and I ended up enriching the low airflow parts of the tables and the engine runs much better. The factory settings for 0 and 16 were obviously too lean. Factory was 382 MV on both and moved them to 400 for 0 and 417 for 16. I need to weld a bung and install my wideband now.

[ony]

I have that happen a lot[ getting corrupted ] I think it could be the chips I have or the programming soft ware gets a glitch in it.

[Fast355]

I copied tables out of the bin I was working on and started over with a fresh copy of BJYM. It no longer hangs in PE when the O2 voltage threshold vs airflow tables are adjusted. Something had become corrupt I guess. I will do a bin compare and see where it went wrong. It was definitely odd. Did some datalogs and tuning today and I ended up enriching the low airflow parts of the tables and the engine runs much better. The factory settings for 0 and 16 were obviously too lean. Factory was 382 MV on both and moved them to 400 for 0 and 417 for 16. I need to weld a bung and install my wideband now.

My old G20 van liked the 02 tables in the low 600mv range.

[brian617]

The factory settings for 0 and 16 were obviously too lean. Factory was 382 MV on both and moved them to 400 for 0 and 417 for 16. I need to weld a bung and install my wideband now.

Which tables did you adjust?