Which injector is failing?

[w_huisman]

I had been experiencing some stalling lately, and had been presuming it was a HPO system leak.

However, we put a scanner on the truck today and the IPR duty cycle never went above 25-30%. Then we talked to a Ford tech (I don't know how 6.0 savvy he was) who thinks its an injector. He thinks the injector gets stuck open and allows air from compression into the fuel system. This would explain why my original post how that air was getting into the fuel bowl.

Do you think this is a possibility? If so, is there a way to identify which injector it is (other than with a scanner)? We have a Lotus scanner, but weren't able to find cylinder balance readings in it. They are probably there and we just couldn't find them, but if there's another way (i.e. unplug injectors one at a time) please let us know. TIA

[w_huisman]

Scanned and got cylinder imbalance faults on 2 and 6 yesterday.

So this evening I'll be pulling the left valve cover to pressurize the HPO system to check for leaks. Will also do the Balloon Test to determine if both injectors 2 and 6 are faulty.

I'm guessing one injector is failed and allowing combustion gasses into the fuel rail.

I'm told the IPR duty cycle on the newer 6.0s at idle should be around 15%, but the older ones run a little higher than that. So with my 03 showing 30%, if the HPO system is leaking, it isn't much. Hopefully pressurizing the system with air tonight will prove that. Then all I need is an injector or two and I should be good to go.

However....I'm still wondering whether or not I'd be better off replacing all four left side injectors while I'm in there. These old style injectors are known to be troublesome.

[GGOODMAN]

you may get more reponces from tec's in the problems forum perhapps a mod could move this for you...

[w_huisman]

Good point, ggoodman. Hopefully a mod will move it for me.

Last night I pulled the left valve cover. I put shop air to the HPO system through the allen screw in the HPO rail, and the system was quiet as a mouse with no apparent leaks.

Then I did the Balloon Test and found air being introduced to the fuel system from the #6 injector. #2 was fine, so it must have been misfiring due to the air in the system from #6. A new injector will be on the way today.

[outlawdiesel]

Ask the ford tec Chann!!!
the only way I see it.is if the copper washers on the bottom of injector is blown out and O-ring?