If you have the extra change $, replace them all and you shouldn't run into any issues. If money's tight do what you have to in order to keep her on the road. You could try looking at the balance test data and see if you have any cylinders that are far outside the range. That should atleast give you an idea if the PCM is reading and attempting to compensate.

injector power balance test

Truck has 186k on it with original injectors. starts great but has the bucking until oil temp warms to about 40F. good fuel, good fuel pressure (62psi), FICM voltage at 47.5-48, batts just replaced, new alternator, new glow plug control module and glow plugs tested in fall by Boyer Ford...

www.powerstroke.org

 

My thoughts:
A) What all needs to come off to get to the single injector??
B) The more stuff that needs to come off to get to ANY side, the greater the plan becomes to replace them all.

As long as this is done outside of warranty work you should have 2yrs/Unlimited miles warranty on the parts and labor......something to triple check....cause if the problems start with the others, you got it covered.

Now don't expect to save any money...I'd bet the "good" injectors are used towards a core deposit. It's not going to be cheap.

 

Thank you gents! I'm honestly not worried about spending the money, I just want to avoid wasting it is all.

Very good point about balance tests, I will check with the Stealer to see what they've done and how it looks. Yes, I hope they warranty their work too! #4 is a PITA to get to and I believe the injectors need to be calibrated/ programmed so I don't want to deal with it myself as I will likely just screw it up haha

Thanks again everyone.

 

Let's us know what the end result is... it's like going to the movies but leaving right before the ending...

 

Hahahaa I know that feeling. Well, I wasn't able to get the data I was looking for, way too much variability. The biggest variable was the quality of fuel and/ or additives used that help preserve injector health.
So, I decided to do just the bad injector this time around but if I loose another, then I'm doing them all.
I've asked the Stealership to hang on to the bad injector and look for signs of metal flakes which would indicate pending Bosch pump grenade (if it even has one).
From my ownership forward, it will get the prescribed amount of Archoil AR6200 in every tank, just like my 6.0h-no gets.
Thanks again everyone, will update thread if anything else happens.