hey i just bought a 2003 duramax...i am the third owner of the truck. and im preety sure that it has a programmer downloaded into it. and i have no idea what kind it is.
If i were to go and buy say a bully dog power pup..will it delete wat is already in the computer and then i can adjust it from there??
please let me know

 

Nope, it will have to be a stock tune before you can re program it. Why do you think it has a programmer? The LB7 is a pretty strong engine.

 

well im preety sure because we have a 2003 gmc duramax stock..and it doesnt have as much snap. And it doesnt smoke when ya floor it.

 

My quad tuner saves the stock tune and then it does it own mods to it, and when i return back to stock it reloads the stock tune.


Some tuners are different, they're are many ways to make HP with programming.

trying to get it as stock as possible would be the best bet.

 

you should dyno it to see what it is putting out. i think the numbers should be 20 percent less than flywhell numbers. if it is less than 20 percent you know it has a programmer on it

 

if you were to go out a buy a programmer get efi live, they you would know for sure whats going in in the ECM

 

I would get it flashed to stock at the dealer, then put whatever programming you like so you know what you have.

 

if i take it to a dealer..they could reset it back to stock? then i can put watever i want on?

 

Yes, but make sure you take it to a mod friendly dealership or they may tag your vin. You are most likely going to have to pay $100.00 for the re flash.

 

I would just take it to the dealer and get it re flashed.