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The video is jroller's - not mine. But I thought it was a great demonstration. The valley is the V shape in the top of the motor. Any of the components that sit on the top of the motor will drain into the valley if they develop a leak. Suspects are the high pressure oil pump fittings (HPOP), high pressure oil lines, turbo pedestal o-rings, fuel filter drain, high pressure oil rail plugs, and probably more. None of those would cause a smoking situation or knock, but would drain to the back of the valley, out the drain hole, and down the back of your motor.
The way to fix the injector would be to find someone local who can do a cylinder contribution test. That uses the computer to "take out" one injector at a time to see if they are all contributing to the rotational velocity of the engine. When you "take out" the bad injector, the knocking and the smoke will quit.
After that, it is just a matter of replacing the bad injector - anyone with mechanical abilities should be able to do that. Just remember that when you pull an injector in these trucks, all the fuel and oil in the head rails will drain into the cylinder, and you have to pump it all out one way or another before trying to start it.
New injectors run about 200-300 bucks. The valve cover gaskets are re-usable, so you shouldn't have a lot of additional expense
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
Last edited by RT; 03-09-2010 at 02:24 PM.
Reason: added pricing