I have an '05 FX4 Screw with the 5.4 3v, 145k miles, and last week on my way to work I got the blinking CEL for a misfire. Long story short, turns out the injector on my No. 1 cylinder was stuck open. I replaced it, had a MotorVac done on the engine, and changed the oil and now we're running good once again.

My big questions now concern what I should be doing moving forward. I'm definitely going to replace the fuel filter more often(used to go every 30k, switching to 15k), I change the oil every 5k. Should I start using Techron, or another additive to keep carbon buildup to a minimum? Should I start running every third/fourth tank with premium?

Any input would be greatly appreciated.

 

I wouldn't change a thing on what you are doing. My dads 05 has a 150K on it just normal maintenance and oil changes no special additives and its a work truck

The only suggestion I have is that the 05s got a bad batch of injectors that were known to stick open. They had a 120K warranty on them but since you are out of that and have already had one stick open, I would replace the rest

 

^^^ I agree. With that many miles and it's age, it's time for a few things to wear out. As part of your maintenance, if you have not cleaned the throttle body or the MAF, you should consider doing so.

 

It certainly wouldn't hurt to start using Techron occasionally - and it can make your next spark plug change go a lot easier. If you have any Chevron or Texaco stations locally, that gas already has it in it.

 

Change the other 7 injectors for sure. It's just a matter of time before one of them possibly fails again and you could be SOL if it hydro-locks next time since your past the warranty on the 05 injector issues. I would get them out of there as soon as possible.

 

I had this happen in my 05 Lariat before I knew anything about the injector issues. Lucky for me the small town dealer I limped into was able to get the TSB and Ford replaced my small block or short block which ever is correct. But it was a 3 week wait while Ford went over the claim and then ship the new block to small town Saskatchewan. Buggers would only replace the 2 defective injectors. Now to replace the older ones works out to be $90.00 per injector plus labor. Think I better sell this baby soon. FS

 

New improved Motorcraft injectors are $27.65 CAD plus shipping from rockauto.com, and are fairly easy to change yourself. The dealer wants to rape you.

 

What the...

You get an oil change, fuel filter change, coolant flush and windshield chip repair with that?
j/k

 

plus "labor"? the only labor involved are removing the new injectors from their bag or box they were shipped in.