2010 LNF cold idle surge & cat delete
Working on an lnf that had a trifecta ECU and swapped out for a brand new GM e69.
I'm not finding the cat disable anywhere. I have COT disabled as well as cat warmup cam tables matching the corresponding normal warm tables.
Issue I'm having is on dead cold starts, idle shoots up to 1300-1400rpm, TPS steady at 23-25%, fuel pressure desired and actual at ~1300psi or so, and spark down at around -25. Looks like spark is trying to bring idle down but can't because the TB is at 25%. During this, you can hear the turbo surging/fluttering. It will stay like this untill it warms up to about 135-140ect. then idles normal at commanded RPM and positive timing and normal fuel pressure. Tried commanding 900rpm everywhere and no change.
It does this with stock DALs and timing tables in the idle regions. Heck, it does it with the completely stock tune I got from GM. Plug in the trifecta ECU and cold starts have a little flare up to 1400rpm but instantly comes down to 800rpm, normal fuel pressure, 5%tps, and positive spark.
This car was bought already modded and still unsure of everything that's been done so maybe they have a bigger TB? Different injectors? This car does have the problematic AEM CAI (or so I've heard) but don't think that would be causing this issue.
Also did a write entire just in case with no success. I've had a few instances with corrupted files before so I figured I'd give that a try.
My next idea was to bring the DALs down on the upper left corner of the table to see if I can bring the TPS down but why would this only affect cold startup?
Tune and log later today
TIA!
