6.2L Supercharged GMC Flashed tune and no start

[HellKnightHicks]

Ive been working with a reputable tuner and made a lot of progress with him working on my my 6.2l Denali Sierra. Got a tune from him yesterday. Flashed it and it starts up but dies a few seconds after. AFR Gauge shows full lean. Not the first time that's happened. No biggie thought i would step back to a previous tune and get it running. But that didnt work. I think the MAF was leaned out too much possibly as thats where the core of the changes were.

But no matter what I flash now it wont start. Even tried stepping the trans tune back out of desperation.

Any ideas? Can post tune and log if need be.

Thanks in advance.

[Ben Charles]

If shows lean did you go over with him?

Could be he just needs to add some fuel...

[SultanHassanMasTuning]

post file we can help

[HellKnightHicks]

If shows lean did you go over with him?

Could be he just needs to add some fuel...

post file we can help

Looks like one tune was lean and one tune was flooded. I was able to Go back to an earlier tune and get it running.

Thanks for hopping in.

Latest tune no start.hpl
2017 GMC Denali 2 Bar Scale Mod 3.hpt
31 - .hpt
31 is the working tune with no log.

The Log and other tune are the non working setup.

[smokeshow]

Why was the MAF messed with if you couldn't get it to start...was it running before this? There are a huge amount of changes that suggest either an overzealous effort to get a supercharger swapped engine started or there are additional modifications.

As for that lean start, dynamic airflow is disabled at 400rpm. Once you're in run mode, all of the high pressure air that is being drawn down in the manifold during runup isn't accounted for to be matched by fuel...so naturally it is lean. Set dynamic airflow enables back to stock so it can estimate fuel properly.

[HellKnightHicks]

Why was the MAF messed with if you couldn't get it to start...was it running before this? There are a huge amount of changes that suggest either an overzealous effort to get a supercharger swapped engine started or there are additional modifications.

As for that lean start, dynamic airflow is disabled at 400rpm. Once you're in run mode, all of the high pressure air that is being drawn down in the manifold during runup isn't accounted for to be matched by fuel...so naturally it is lean. Set dynamic airflow enables back to stock so it can estimate fuel properly.

There are other modifications.
Larger MAF housing
Smaller pulley
Boost referenced.

I think the tuner is going for a MAF tune.

[azsteve01]

Did you ever get this working?

What brand is the supercharger...they should have given you some kind of tuner to get your engine running...Has the guy you are working with done superchargers before, specifically the one you put on?