Have a 04' F250 with 6.0 this thing has been grief stricken from go. Have fixed numerous problems. This thing sat for bout a year with Bio diesel in tank. I dropped tank cleaned tank out thoroughly. I have changed filters twice in 2000 miles. The first time they were red and sticky. I ran farm fuel after cleaning tank...... No Issues........ Till I filled it the second time with 10% bio blend. I didn't go 10 miles and started sputtering and had no power. Actually dies on occasion, idles very rough. What's crazy is that it comes and goes. I put a cetane boost in good for 100 gal. If anyone has any idea WTF is wrong with this beast or has had this issue, I would GREATLY APPRECIATE your input.

 

I'd scan it for codes and do a cylinder contribution test, maybe you have injector problems.

 

Have replaced 4 injectors, and rear HP oil pressure tubes, replaced front HP plugs in front. There is no doubt 100 % this is fuel related. Just can't figure out why its so picky. Have had it on computer.... No codes !

 

Whats your fuel pressure at?.

 

Who's injectors did you use?

 

Injectors are FOMOCO. Haven't checked fuel pressure.

 

The damn thing runs great, till I put Bio in it then goes to hell

 

IIRC only use a 5% Max Bioblend

you can bubble test injector

 

How abot live data


codes are justa Bonus if you get them

 

Have you also checked the ficm voltage?

 

B10 and b20 are a nogo for our 6.0's?

 

B20 is perfectly fine and in some markets (Rust Belt comes to mind) you can only purchase B10 diesel.

Josh

 

What is ficm voltage ??

 

Fuel Injector Control Module voltage. There is a good tutorial in the tech folder on the FICM, it's functions, and how to check the voltage. If the FICM isn't functioning properly it can give appearance of faulty injectors and make your truck run like A$$.

 

Thanks I appreciate all your help. If the ficm is bad is it a constant or can it come and go ?