gMAG

iTrader: (1)

I have a mailorder tune.
Is there a way I can verify with AutoTap, how accurate the air/fuel tables have been set?

joecar

You really need a wideband (lets you compare measured AFR against commanded AFR).

gMAG

iTrader: (1)

Thanks, Joe.

got-a-ls1

iTrader: (12)

yep wideband is the first thing to buy if you want to tune a efi engine, followed by tuning software lol.. for 200 bucks it amazes me how many people wont buy one.

joecar

During closed loop you could look at the LTFT's, these will be close to zero if the MAF (steady state airflow conditions) and the VE (transient conditions) are correct.

But, anything outside of closed loop a wideband is required (e.g. at WOT you can't rely on HO2Sx1 voltages being above some value since these are not "calibrated" to provide voltage:AFR conversion; some people are lucky and get away with this, but it is a bad idea).

gMAG

iTrader: (1)

Joe,
^^^LTFT's is the theme I was looking for....just a way to verify closed loop enrichment. There are a couple of issues happening. First one is overly rich @ idle, and maybe rich off idle. I have P0154 bank2 -1. Then, an idle motor stuck on zero.
Once the bugs are worked out, the car will be dyno-tuned.
Thanks!

joecar

Glenn, you see where this is going... (you're heading towards learning how to DIY tuning)

gMAG

iTrader: (1)

Yes, sir!
I hope to ascend to the rarified air of the LS1 kingdom!

joecar

lol, it's not rarified anymore, there are too many people doing it, it has become a must for the DIY/carguy.

crainholio

iTrader: (2)

IAC going to zero usually means unmetered airflow from a vacuum leak, or somebody screwed with the TB and it's letting in too much air at idle.

JoshuaGrooms83

iTrader: (2)

this seems like the next thing i keep running into that i need to buy.... ug.