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white smoke - narrowing down which injectors to replace 7.3L 2000
New to me 00 f350 doesn't have blowby or anything and runs well once warm, but lacks power until fully warmed up & you really step on the accelerator. Smokes white all the time, not terribly but even when fully warmed up after a 100 mile drive, still smoking white. I've worked on 7.3L injectors before and this has the same white smoke I've seen before on these engines and other diesels with bad injectors...but despite my suspicions I went through and checked/fixed up everything that could be related or suspect... Fuel, oil, hpop level & pressure, fuel pickup, fuel pressure, fuel filter,air filter/intake are all good.. ICP & IPR, pressure ok and no error codes.
No issues on injector buzz test. no failed cylinders on cylinder contribution test. misfire delta around 1-4% on injectors 4,5, and occasionally cyl 1. --I don't really know if misfire delta as reported by my cheap obd2 adapter & car gauge pro app means anything.. *any thoughts on that?
I am trying to save money and just get by with replacing a set of 8 o-rings and ONLY the injectors that really are bad, not a whole set, for now. I don't ever have plans to upgrade any more than stock power levels.
Pulled the valve covers and ran it cold, all 8 injectors are squirting oil out the deflector, (*I'm wondering if I should be looking more closely for low oil flow? - the back ones are hard to see clearly how much oil is coming out, but there is some).
Next I (carefully) pulled one injector electrical plug off each injector while running, and I didn't find any "dead" cylinders (where if you pulled the plug and it made no difference in how it ran, that would be a bad injector). There were no abnormalities that could be pinpointed comparing the sounds of this test between cylinders.
***So now I'd appreciate your thoughts on ANY further steps I might take to troubleshoot specifically which injectors are bad.** thank you!