Ive been having an issue with my spark wanting to jump back and forth under load.... with the converter locked in OD (and other times) the spark will jump from say 15deg to 10deg and back very rapidly causing the truck to lunge... what could be causing this??? Ive included a log, I scanned it with the default scanner config because I couldnt get mine to work right... I'm 2 bar OLSD...

 

Have you tuned your VE table yet with a wideband?

 

Im doing that a little at a time... its rich right now.... where I'm getting the spark problems is in the 80s and 90s Kpa and 12's AFR.... under boost I'm sitting in the 10s AFR

 

You said that your OLSD, but your fuel trims are active.... From what I have seen, fuel trims being out of whack will reference the wrong position on your spark table....

 

I guess I need to disable the trims??? thats makes sense for it to be doing that... if it were truly OLSD the trims wouldnt be there I guess.

 

For the most part

OL = no trims, no O2 sensors controling fueling
CL = Trims and O2 sensors controling fueling

Now you can kinda mix the two like some do on here.....



IMO I would disable the trims, start with a conservative spark table and tune your VE table via the wideband.... Then start working on the spark table... But that is just my opinion.....

 

yeah, I understand the difference in OL and CL but this is just how the HPT 2 bar is setup in their default... I havent changed that part of it...

I'll disable them this afternoon and start more work on the VE.... I was gonna kinda do it opposite of that but it makes sense...

 

I always do spark last, but that is just the way I do things, IMO it is safer and more accurate....

 

Give this a try,
under Spark Control /Spark Advance/General/AC Bump Tq Spark set this to Dissabled.
It maybe this changing your timing.

 

Thanks, I'll give that a shot....