Hi, I new to this stuff. I'm working on a 07 LS2 cstv, magnacharger, 78# injectors and now an ls3 maf. Its a maf only tune so far. I had the tune great with the injectors scaled, then installed the ls3 maf. I scaled the maf and have it running well in open loop. When I go to closed loop and enable the ltft's they cause it to go +25 rich. Any ideas what could be causing this?
Thanks, Julian
Post the tune, log, and config so we can see whats happening.
2000 Regal GS ~ 3.25 Pulley ~ Headers ~ 3"ex ~ 1.85 Rockers
Sold 06 TBSS ~ Front Mount T88 ~ 0-30 in 1.17 ~ 0-60 in 3.0
Wanted ~ Engine-less 95/Older 4x4 ~ Jeep/S-10/Ranger for TT Project
4.9 fup.hpl1_1 rears, 2_7 front, 78 injectors_LS3_maf_4.9.hpt
Here you go.
The maf and fuel injectors are both scaled 1/2. After this I went back and scaled the maf by 3/4 since I won't see the upper section of the frequency range. Doing that fixed the throttle fluctuating uncommanded along with this issue.
Also, after some more reading and looking at this, I was wrong before, the LTFT's were calling for it to lean up. So it was going the right direction. The weird thing is when I am driving in open loop on this tune it was fine. I don't know what caused it to go so rich in closed loop.
Last edited by 2007V; 02-14-2014 at 06:54 PM.
4.9 closed loop, fuel trim learn off.hpl
This one is closed loop I guess, but I had the fuel trim learn off in the VCM controls tab.
I don't really understand it.
Thanks in advance for any input.
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