Bucking at 155 to 175 EOT

[dpmac83]

My truck has had a slight sputter or bucking to it for a while but it has been getting worse lately, More pronounced in cold weather. I am kind of at a loss as to what can be causing it. My STC just failed so I replaced the STC (upgraded) and IPR as well as the HPOP since I was in there. I was hoping that that would fix the problem since the STC was loose, But the bucking is still there.

It only happens under very little load, lower RPM's . If I make the truck downshift and spool up the turbo it stops. This makes me think it has to do with the EGR delete and not having a programmer to tell the computer that it is no longer there. Does this sound right?? I am hoping that the programmer will fix the problem (helps me sell the programmer to my wife!!)

the truck has the egr delete, Studs, blue spring mod, Factory Air intake w/CFM largemouth, Coolant filter. New HPOP, IPR, STC.

[dpmac83]

I use the cts to monitor, so today I was watching my FICM voltage. It stayed at 47.5 to 48V the entire time and the bucking was still there.

Is there anyway to check to see if the EGR delete is causing the issue. My egr cooller and all is deleted but the EGR valve is still installed and plugged in to keep from having the CEL. If I unplug it and get the CEL will the computer adjust to not having it and test it that way??

[dpmac83]

Anyone????

[twoicebergs]

That is a sign of a bad injector. Get a contribution balance test done and expect at least one, maybe more.

[dpmac83]

I guess the shop is the only place to get that test done? I dont have any fancy equiptment, just a CTS and a Bluepoint diag tool but i dont think it does that. JHow difficult is it to change injectors, I have never done any?

[10secondC]

they are not that difficult to change but at $250 each you don't want to guess which one it is.

[dpmac83]

If it is my injector(s) going out i plan on changing them all because I dont want another one to go out in 2-3 months and have to rip into the truck again. I have heard a bit about warren, casserly, industrial, and River city injectors but have no idea who's are the best and who's are the best for the money. Can anyone help out with that?

[Super Diesel]

From all of the 6.0 injectors I've seen, I'd either go with Warren injectors or Renegade injectors. You can either go with stock replacements or go with bigger injectors... but know that with great injectors comes great responsibility.

Just kidding... but bigger injectors will require a full fuel system.

[dpmac83]

So anything bigger than stock will require a bigger pump?

[twoicebergs]

Not totally. 175s will be fine. Anything larger you have WOT issues if you run like that too long.

If you were concerned about down-time, as long as the injectors are not high milers, just changing one is no big deal. Have a plan for more, but you don't know what the buzz or contribution balance on a cold motor or diagnosis is. However, if you have 2 on one bank or 3 or more bad, decisions have to be made. It could be as simple as 3, a full bank or all of them. The problem is, unless you know the history of the truck, you don't know the best path to take.

Now, if you want to upgrade, set your goals, but remember yo are going to have to live with it after you create it. Choose wisely and have a total budget in mind for the power upgrade. If you go to large, you will spend a lot more on other components to make it work correctly, and you can expect parts to fail as you play with it.