2005 LS6 CTS-V with heads/cam/intake
I'm very new with hptuners but have a few knowledgeable people helping me out. I know you don't have to have LTFTs to tune but I'm having trouble with always getting 0s for LTFT but getting readings for STFTs. Overall, my issue is an intermittent dip and bounce in the idle when coming off heavy gas. I think that's related to my injector tuning but I want to eliminate o2 issues as the cause and no LTFTs is making me think I have something up with my o2s.
Oversimplifying but - everything I've read says getting LTFTs is based on reaching specified ECT and MAP pressure (which I'm reaching) and having good o2s (which are oscillating fine but I replaced them anyway & tested the wiring back to the PCM every way I know how). I've also read having an exhaust leak will prevent LTFTs but I can't find a leak. I thought maybe it's something bad in the PCM/ECU so I swapped in another I had. Same issue. Here's the first tune I tried.
base.hpl05v_base.hpt
You may look and see the STFTs are right around -1 and maybe LTFTs just aren't supposed to be anything but zero. Well, I friend gave me a "start over" tune that sends STFTs up into the 20s-30s (with instructions not to push it above 50% throttle with this tune) and should cause LTFTs to kick in. I also "forced" Closed Loop in VCM Scanner. That tune and log is below and still no LTFTs.
Base 1.hptpost-base1.hpl
Am I getting STFTs because STFT Open Loop is enabled - and I'm not getting LTFTs because I'm truly in open loop?
Thanks in advance for your thoughts!