cdub81

iTrader: (2)

I was trying to tune the VE via wideband, followed every damn tutorial I could find on sd tuning. I pulled the maf signal wire and set up the tune the way it should be (I think) to be OLSD. When the truck initially starts it goes to 12ish on the wideband which I assume is from afterstart enrichment. Then truck will stumble after about 3-4 seconds and lean out to 18, 19, 20 afr then die. So for shitz and giggles I loaded my stock VE table before engine swaps/mods and tried, same thing. So I multiplied the table 100% and the startup was stupid rich but then idled around 12's, so I decreased the whole table 15% and the afr was now 13.5ish jumping around.

So my question is... Obviously that's not right to have the VE table increased like that but I'm missing something I guess...
I've even zeroed the maf curve out trying another method I read about, no difference.
Tune attached

EDIT:I attached the tune that I currently run before I tried to tune the VE table

MustangPunk

iTrader: (1)

how hot is it out?? sounds like common iat heatsoak lean out... did you drive it around and see if it fails back inline after a short drive?

Atomic

iTrader: (42)

For SD, set the maf fail frequency to 0 hz.

For OL set the closed loop temp to 285F.

cdub81

iTrader: (2)

This was from a cold startup 70 deg outside. Can't be driven, right after startup it goes lean then dies. It will stay running with the VE table values doubled

It is already set that way.

Atomic

iTrader: (42)

When you said you pulled the wire I didnt know what you meant. If the MAF is really failed then you should get the MAF DTC.

If it works decently after doubling the VE table I would say your IFR table is wrong.

cdub81

iTrader: (2)

Hmmm, they're LS3 injectors out of a 2010 Camaro, used a conversion sheet off HPTuners to convert some of the data since it isn't the same.

Here's the IFR table:
41.73 41.98 42.23 42.47 42.72 42.97 43.22 43.47 43.71 43.96 44.21 44.46

44.71 44.95 45.20 45.45 45.70

Tune is attached also

Gadgetized

iTrader: (9)

I dont have HPT but if your MAF is reading properly, and your VE table isnt it sounds more like a calculation with the cylinder volume to me. Like I said I cant even open the file, just something you might want to make sure is correct. Was your MAF also increased at one time? Another thing you might want to check is that if you have a flex fuel vehicle and it is reading an inaccurately high ethanol value it could cause that problem. If you dont use E85 it might be best to just tune it out.

cdub81

iTrader: (2)

Cylinder volume is 0.74590, which should be 6.0 etc
Yes the maf and VE tables have been changed, truck runs good, I was just going to try and work on the VE more to get some throttle transition rich/lean swings calmed down, they're not to bad but maybe I'm OCD.

No flex fuel, I'll just tweak on the maf some more until I can get this figured out.

Gadgetized

iTrader: (9)

If the MAF is 85% higher than stock, and the VE is 85% higher than stock I would agree with Richard as the fuel injector info is not correct.

cdub81

iTrader: (2)

Maf has been raised a little from stock, when I swapped the the ls3 injectors in I didn't have to change the maf at all, maybe some more smoothing since then but nothing drastic