No, a tune cannot go "bad"

You have a unknowledgeable shop grasping at straws.

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it could be a “harmful” tune, but i’ve never heard of a tune going bad. Early on, tunes made power, but were crudely written, spiking drive pressures etc etc. newer tunes (depending on the tuner) are more refined

 

They say the tune [[truck]] was advancing the timing and injector pulse rate that caused the injectors to go bad.

This part might be true, but it's not likely the tune suddenly going bad is what was causing it. Figuring out what is causing that would require a lot more diagnosis.

More likely something else causing interference and/or a cam/crank sensor failing. A bad alternator/ground could cause all sorts of havoc.

 

The shop working on my truck said the tune on my truck has gone bad and they put a new tune on it.
A little back story, the truck has been in and out of the shop for 6 months with injector issues and 19 injectors installed in that time.
They say the tune was advancing the timing and injector pulse rate that caused the injectors to go bad.
The truck has a Smarty Jr which has been running the same tune since 2012.

Any Thoughts if this makes sense?

How did they put a "new tune" on it? And no, your Smarty Jr. tweaks would not go bad. And no, they wouldn't cause premature failure. While timing can be adjusted with Smarty Jr., the changes all still fall within stock map limitations. When and how long the injectors fire using Smarty Jr. is a non-issue. If you compare a more extreme file like SSR duration to stock duration, they are nearly identical. If you compare timing maps, the SSR peaks at roughly +22 at 3500rpm and 75% load. Well below any danger zone. Your Smarty Jr. doesn't even approach the levels of SSR. Your transmission is about the only thing susceptible to the slight power increases and early torque onset. Oh, and FYI, pressure can kill injectors, not timing and duration alone.

 

Do you have a rail relief or is it plugged?

Also, where are you buying injectors? Who’s installing?

 

Thank you all for the information. the shop working on the truck has installed all 19 injectors. They were all Bosch.
I am not sure what the rail relief is?

 

Thank you all for the information. the shop working on the truck has installed all 19 injectors. They were all Bosch.
I am not sure what the rail relief is?

The rail relief he's referring to is a Pressure relief valve that's on the fuel rail, if it hits the high pressure point which I think is 30k rail pressure then it'll vent the pressure off to prevent injector damage.

This shop installed 19 injectors over the past 6 months and you continue to do business with them? That's not concerning at all

 

No, but a fart can when you get older. LOL