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Going to have to send off ECM to be unlocked.

Yikes. So you think manufacturing defect with the one manifold or across or rather two at this point. That?s an insane catch. How did you get to the...

To get access, they say to send an Email. Unfortunately the Email account they specify is closed.

A manual transmission would be preferred, but anything would do. I am interested in things like acceleration enrichment as well as the base fuel.

Fuel system is return style already, PATS was deleted with HP tuners and shows its deleted, ECU does not see that its in Neutral even with Force...

Awesome. I'll check it out. Appreciate it!

This file is pretty close to what your Envoy would have been stock. Only segment 2 is different and only by 1 digit. It should be close enough to use...

i just came across this old thread cause i am having the same issue the only difference is i have a 28.7 tire and the same 4.10 gears. can someone...

That was a quick response! The vin is 1GKET63M962328372

Without your VIN there is no way to know what calibration would be correct for your Envoy. I have 3 06 Envoy 5.3L files and no two of them are alike...

See if this helps

Interesting that at 5250 you're at 395/395 and I'm around 390/390 or so... I know this isn't an indication of true #'s....but to me, you should...

here is my last tune and a run for you to look at. It is clear that the longtubes help you big time!!

Its the intake manifold. I just went through the exact same thing. The injector angle is canted opposite of what it actually should be. There will be...

24 and a half is the best i can measure.

This will fix the incorrect Trans Revs/mile. The calculated tire dia was 24.99". Looks like your throttle is only opening to 71-78% most of the time,...

I was able to drive it today. Needs 5ish% of pedal to start but it then idles and drives ok. It does not stall out and returns to idle. I know the...

Interesting. Your MAF table is very close to OEM calibration, which hugely contrasts mine. I suspect it has a lot to do with the shape of the air...

Nobody?s got any workaround or advice on this?

Well, segment swapping the trans and trans diag from a manual vehicle did not get it to work. I will try the complete 2003 manual file next.

your maf is pumping a lot more fuel than mine and your main VE is telling it way less than mine.... The Longtubes vs. manifolds/cats likely make...

Following....only differences on my 05 to yours is the exhaust and cam....I am 226/238 .600 .600 113lsa +3 and stock manifolds/cats. Our power is...

The method he is talking about gives you the max pressure output for the fuel rail. That is important. Everything is "based" on that max regulated...

Give me more info. What PCM? Manual? Auto? What year? What OS do you want?