Ok so I have a '05 F350 with 6.0l and I am sitting at 305k miles. The only things I have had to do anything to or with are new batteries, fuel filters, blower motor and resistor, and the cold air intake tube. At 305k what do I need to really watch for?

 

Get a monitor that reads the PCM parameters. ForScan is really the best scan tool because of its thorough code retrieval and the tests it can do.

FIRST - retrieve and post the code numbers!
Monitor:
Coolant Temp
Oil Temp
Transmission Fluid Temp
ICP pressure
ICP sensor volts
IPR % duty cycle
FICM MPower
FICM LPower
FICM VPower
Injector pulse width

Once you are monitoring the engine parameters (PIDs), then evaluate the health of the oil cooler. This might tell you something about the risk that is possibly there for a blown EGR cooler.

Install a fuel pressure sensor and gauge and watch fuel pressure (must be over 45 psig at all times). Low fuel pressure can damage injectors. If your injectors are still the original ones, then that is somewhat amazing. I would bet that they would need changing. If so, buy OEM re-manufactured injectors. Do not buy cheap on-line injectors. If you want injectors for more power, Holders Premiums and Full Force Diesel injectors are among the best.

The inherent weaknesses of the 05 are:
1. Weak EGR cooler. Replace the OEM one with one from BulletProofDiesel
2. Ford Gold coolant is prone to plugging up oil coolers (which can then cause the failure of the EGR cooler). Change the Ford Gold and put in an EC-1 rated ELC coolant.
3. Discharge fitting on the HPOP is prone to failure. A one-piece fitting upgrade is available and works exceptionally well.
4. The original standpipes and dummy plugs are prone to failure. Even the upgraded ones seem to have a limited life. Issues with these will be evident if you are watching ICP pressure and IPR % duty cycle.
5. If you don't maintain your alternator and batteries, the FICM may become unreliable. An upgraded FICM from FICMRepair.com or CircuitBoardMedics.com is a good investment IMO.
6. Fuel pressure regulator spring is weak from the factory. An upgraded spring is available. Monitor your fuel pressure first.

Use OEM oil and fuel filters.
Change oil and fuel filters at recommended intervals.

If data identifies a low ICP pressure, then an air test of the high pressure oil system is probably the next step.

 

WOW, 305k on an untouched 6.0? You must be blessed by the Saints themselves. Service the engine frequently, no more than every 5k miles. Use Ford Filters on everything. B.

 

Probably just didn’t make it more better.

 

That someone will tell you to do something that you haven't...and you'll follow their advice. If you've put the 305k on the truck and you haven't done anything more to it than you stated here...keep doing what got you here.

 

Ahhhh! Why did I read this thread????? 😂

I have well over 300k miles, close to 350k…and unless the injectors were changed between new and 85k miles when I bought it they are original. No record of them being changed in OASIS report.

Sooooo is this a “change them preemptively” sort of thing I should get ready to do? 😬

 

Sorry to do that to you!! I can delete that part for you if you want, LOL.

You may very well have original injectors, but 350k would be the most I have heard people get on them! IIRC, 300k (or close) is about the most I have heard of.

Tough call on changing them out pre-emptively. They do have a limited life and you are way out on the high end.

I have recently seen my fuel economy start to decline and I believe it is due to "injector wear". I am at 235k miles.

I get worried about all this supply chain BS. I would hate to have injectors fail, and I can't locate "quality" injectors to purchase. I also don't want to get to the point where an injector starts dumping excess fuel. I guess also, I wonder if Ford isn't getting cheap on who they use to re-manufacture critical parts.

 

Too late, the damage has been done 😜

Yeah, I’ve thought about replacing the injectors in the past but…when I start up, even when cold at 20* oil temp there’s barely a stumble immediately when it starts and then it’s totally smooth. But…it could happen all of a sudden. Especially with such high mileage injectors. 😬

This reminds me of my fuel pump. Changed it at around 275k miles just in case. And the new pump has the EXACT same pressure under all conditions 🤦‍♂️😂

 

If you drive 15,000 miles a year, and a new set of injectors improves fuel economy by 10%, then you can get around a 4 year payout on new injectors (with a few assumptions). Of course there is no guarantee on fuel economy improvements, but it should certainly improve with new injectors vs ones at 300k miles.

 

So since I drive about 45k miles a year…totally not worth it, right? 😬🤣

I’ve been getting 16-17mpg since I initially lifted it 6”, tuned it, and put 35’s on. 100k miles ago I lifted it another 2” and put 38’s on…surprisingly still getting 16-17mpg. Though I have had more occasions where it’s low 16’s or even high 15’s once in a while. Arrrrrgh!

 

That is really good fuel economy. I doubt you could do better with new injectors.

 

Yeah, I doubt I’d get better fuel economy, but it’s definitely been in the back of my mind that one or more could go bad suddenly. I’ve thought about getting a set to have for when it happens, but then I’d lose out on the core charge.

Although, I could use it as an excuse to get Full Force 155/30’s… 😉

 

No kidding Jack. How many threads have we seen that started off with "Bullet Proofed" in the first line? Too many. Mods don't always make things "better". B.

 

I’m thinking it’s time you started a “fuel injector life” poll/thread thing like you had for fuel pumps. Then I can REALLY start to let the demons in my head run wild… 😆

 

I think we scarred the OP away. She's prolly running down the interstate with her hair on fire about now. LOL. B.