I gave a diablo sport tune on my 2015 GMC Sierra. I did the 87 octane tune and disabled AFM. And did the Firm shift transmission selection.
My question is What parameters did this tune change? As far as the firm shift goes, what did it change?
I have a friend that owns a Transmission shop that say ...
Search found 2 matches
- Tue Jan 27, 2026 12:19 pm
- Forum: General Questions
- Topic: What parameters are set with tune.
- Replies: 1
- Views: 163
- Tue Jan 13, 2026 8:03 pm
- Forum: i2/i3 for GM vehicles
- Topic: Emissions testing
- Replies: 1
- Views: 115
Emissions testing
I just downloaded an 87 octane and AFM/DOD delete to my 2015 GMC Sierra. 5.3. I have an emissions test’s required yearly coming up soon. Will it pass with the tune or do I need to go back to the stock tune?