On the way home from work, after about 45 miles of interstate, I pulled on to highway to my home and I noticed a loud knocking. I'm not a diesel guy, so it just sounded like rod knock to me.
Got home and upon further inspection it sounded more like an injector nailing. The nailing is somewhat erratic and there is a miss that's varies in intensity as well. The nailing goes away when I crack the line to the 3rd injector. The miss intensified somewhat.
I have some observations:
1) It seems weird to suddenly develop such loud nailing (I generally work on gas and HEUI injected powerstrokes)
2) Why does the nailing intensity change?
3) There's a ton of air, almost no fuel, in the fuel return line between 2 and 3. I replaced that line today while I had it apart (after the issue) because the was diesel in the injector well. None of the other look that way. What could cause this?
Did my injector just bite the dust?
For your viewing pleasure, some one-handed shake came footage:
https://photos.app.goo.gl/Rgbjaiz43Kcoo5hn7
https://photos.app.goo.gl/mF1CatjBoN31S1SH9