2004 6.0 rough running 2 injector codes. Please Help!

[dzlpwr1]

Hi Everybody-
Been searching for an answer here but have found no definite answer. My 2004 f-350 started running rough (especially in overdrive) Gets better when it downshifts. It starts fine and has not stalled. I noticed this while hauling a trailer and thought it was gelling and needed fuel filters. Treated fuel, replaced filters and more of the same. Computer is showing PO269 and PO284. The buzz test revealed nothing and said all injectors were fine. I do not want to throw injectors at 3 and 8 if this not the issue.

Any help is greatly appreciated.

Justin
Salisbury, NH
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[sixpoint0]

Check your fuel pressure, and FICM voltage.

Originally Posted by dzlpwr1

Hi Everybody-
Been searching for an answer here but have found no definite answer. My 2004 f-350 started running rough (especially in overdrive) Gets better when it downshifts. It starts fine and has not stalled. I noticed this while hauling a trailer and thought it was gelling and needed fuel filters. Treated fuel, replaced filters and more of the same. Computer is showing PO269 and PO284. The buzz test revealed nothing and said all injectors were fine. I do not want to throw injectors at 3 and 8 if this not the issue.

Any help is greatly appreciated.

Justin
Salisbury, NH
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[ajpu1983]

Run a compression test

[dzlpwr1]

Ok Thanks guys- I'll see what I come up with.

[deucer]

I could be wrong, but I don't believe it is electrical. I'm more towards fuel feed imbalance or sticking injectors. Striction possible. Do you run a fuel additive periodically for cleaning/lubricating injectors such as Stanadyne, Power Service or Lucas Injector cleaner?

[dzlpwr1]

Thanks deucer. I usually do, but have not put any in since last summer. I am leaning the same way. I have since added power service but need to drive it longer to let it work through the system. Any thoughts on the Hot Shot's Secret oil additive? What they "claim" the product cures, also makes sense to me.

[deucer]

Oil additive: RevX 8 oz. It does work on eliminating striction.
Rev-X Application Guide | RevX Performance Oil Additive http://www.blackclouddiesel.com

[sixpoint0]

When is the last time you changed your oil? How often do you change it? I would recommend a 5W-40 synthetic oil. You will notice faster cold starts and if you have stiction it will greatly reduce it if not get rid of it completely.

[dzlpwr1]

Last oil change went long... 10,000!! My employee wrote the wrong mileage down when he serviced it. UGGHHH. We normally always do 5,000! I typically run Rotella 15w-40, because that is what we run in all my heavy equipment.

Is the 5w-40 good in all temperature ranges?

[deucer]

http://www-static.shell.com/static/c...rotella_t6.pdf

I run 5W-40 also, but with RevX also...