losing my mind, need some help

The car is a 2002 Ws6 Trans am with
6.0 iron block bored and stroked to 412 ci
LT headers
no cats
full exhaust
Custom Cam 240/240 609/609 112LSA
Fi tech black 42lb injectors
T5

The car came in possesion of my brother and it obviouslly was thrown together, we have corrected much mechanically but the tune almost seems too far gone. I pulled what was off the car... the car has the following issues

awful idle quality
extreme rich idle- will make your eyes weep from the smell
Commands a .90 eq at idle and cruise
Doesnt seem to enable PE
ive been unable to get a log worth anything due to that

Tune attached
Attachment 86464Attachment 86464

IM wondering if i should start from scratch or if this one could be saved, thanks for any help

new to this myself but you can usually type in specifically what question you are wanting to ask in the search bar and it will pull up info. like 42lb injectors you can type that in and it will bring a thread up. I looked at it once I have 42lb injectors also and you have to change pulse width. way down to like .03 something. wish I could be more help, but learning.

Your injector data shows 36ish/lb/hr where as you typed out 42lb/hr. Double check what pressure that was for. If it's 43.5psi and you are running 58psi which was factory, the data is even more out of whack.

Verify the min injector pulse, offset vs volts and short pulse adder are correct for those injectors. If they came with no data, then that will be a lot tougher to dial in. You could maybe steal data from another vendors 42lb/hr injectors to try and help you.

You open loop EQ ratio must be set to 1.00 for temps over 130-140 degrees. Otherwise if you read how the table functions it will always be richer if you are disabling closed loop. You can lean out the rest of the table some too if you like, it's doesn't have to be as rich as the factory tune is while it's warming up.

If you have o2 sensor faults it can also not enter closed loop operating and aim for stoich.


I would enable the short term fuel trims but disable the long term trims. You must get yourself a wideband o2 sensor so you can properly tune the airflow model. Probably 90% of the issue will correct themselves if the fueling is dialed in.

Power enrichment is delayed to 5,500rpm, remove that limiter or reduce it. Then raise the MAP enable from 15kpa to something like 80-85kpa instead and use the pedal enable to control PE.

This computer has the ability to use a speed density enhanced OS, you should apply that if this will be staying speed density. It will remove the secondary VE table and make tuning the primary VE much easier.

I should of been more specific. Wideband is present. Just didnt dive too deep into it because the tune is so far off I didn't want to drive the car yet

Did some digging and pulling lol. The fuel injectors are FIC redone factory ls1 to 42lbs. Flow matched to 1%. The fuel pump is the factory pump as well.

It's a shame people touch these things and mess them up so bad.