I have an 04 f250 with late model engine, I had the truck scanned by a local shop about a month ago and was told injectors 3 & 4 needed to be replaced. Replaced them and truck ran great, shortly since(less then fifty miles) the truck has started to smoke white(smells of raw diesel) under acceleration or load and has a miss at idle. I also noticed that it "fishbites" or jerks/stumbles at a constant speed, then when you speed up it's fine(not sure if this is related or just a transmission issue) So...I purchased AE and it had p0269, cleared all codes, did buzz test and passed, then throws p0269 code within just a couple minutes of idling. FICM voltage was >47v and there were no circuit fault codes so I assumed it was just a bad reman injector and had it warrantied out at the parts store and replaced....no change what so ever. Not quite sure what to do from here, I assume I'm probably having an issue related to a cracked injector cup or bad injector harness but I'm not sure how to diagnose? Thanks

EDIT for additional info: Truck has about 200,000 miles, egr delete, and straight exhaust, fuel filters replaced just recently

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I saw a video online of someone doing a compression test of some sort a scan tool based upon the load on the starter to check for compression issues before replacing injectors, anyone know if you can do this with autoenginuity?

 

To update #3 has no compression, wet test had no affect. Pressurized cylinder and it's not a valve issue, no sign of air entering coolant, air is exiting into crankcase. Probably going to part the truck out, going to see if dad wants to convert his 2wd 7.3l to 4wd. It's a black extended cab electric 4x4 with leather interior if anyone is interested Lol

 

How are you sure it's not a valve problem? I'm not much of a diesel mechanic, but I know gas engines well. I wonder if you have done a leak down test. If by chance the valves are not sealing properly, you will not have any compression, however, if the valves are that far out of wack......something is way wrong. Wish I could help more

 

I used the fittings from my compression tester to attach an air line in place of the glow plug and pulled the valve cover and watched for the valves to close and listened/felt for no more air to escape through the intake or exhaust. I can't feel/hear any air escaping through the exhaust or intake what so ever, just a lot through the crankcase, which was a substantial amount more then the other cylinder I compared to. I guess I could try removing the rocker arms in an attempt to be certain the valves seat 100%. I did have issues with a gas engine in the past that had the slightest miss due to a bent rocker arm keeping an exhaust valve open(had no internal damage amazing enough) that I diagnosed in the same manner as I mentioned above, but then I could hear the air escaping through the exhaust while all my noise now is through the crankcase :/

 

What did you figure out was the problem if you did?

 

I'll upload a picture when I get home to a computer

 

Sorry I haven't been able to get a picture up, but tore into it and #3 piston was melted down and put such a huge gash in the cylinder I don't see it being usable at all. Installed a Craigslist find lower end that ended up being junk. Not really catching a break with this truck