well since you said "quiet" on "injector test" I'll assume you mean the buzz test.... that doesn't tell you anything unless you are looking for a cause of a cylinder that isn't firing. Generally each injector should sound similar BUT often some have been replaced and sound different than others. Also this only tests the solenoid on the injector which can be changed for MUCH less than the injector.
Start with pulling the oil fill cap and setting it upside down over the oil fill with the engine running..... sits there and rattles around till it falls off=good... gets knocked off by blowby= not good
as we get a bit more intrusive we need to do a few cyl contribution tests and a compression test. the former requires more than a simple obdII tester... you can pay the dealer for an hour of labor. I use auto enginuity which is a pc based scan tool. ($400) The compression test requires pulling the valve covers and glowplugs which is NOT fun in an econoline. Everyone and their brother will tell you that your injectors are tires and need replaced and there IS some truth to that but mainly it's a reliability issue. I put an engine in my truck last winter because I had an injector go bad and I tried to limp it home a few miles blowing white smoke. shattered rings and scored cylinder.
Many many 7.3 drivability complaints are fixed with a new ipr (in the back of the high pressure oil pump) and a new icp (oil rail in front top of the dr side head)
Sadly, the 7.3 is VERY tough for the average diy'er to diagnose and you REALLY need to make sure the engine is healthy before considering any power adders.... a tired worn out engine will die a quick death when you start pouring the coals to it.
There is a forum that I HIGHLY recommend powerstrokenation.com that I used to spend a lot of time on but haven't been on much last year (my name there is gottagofast)
There ARE some folks there that put intercoolers on the econolines and can walk you through it
A word of warning.... You WILL be told that big exhaust, big intake, tuner, etc will all build power and increase mpg's.... You will hear this a LOT and it simply isn't true.... truth is that the tuner will gain you power and MAY gain a LITTLE mpg but no where near enough to matter and pay for the mods EVER.
The factory air filter on these is fine for a mostly stock engine and there is a napa filter (#6637?) that flows much more for FAR less than the $300 + I payed for mine... the exhaust is a good idea for reduction of egt's after mods but WILL NOT gain ANY power or economy. Diamond eye on ebay is as good as anything out there for less.
Before you do ANY power adding mods you need an egt gauge. Any power increase gives you the ability to melt down the engine so you need to know what's the temp is.
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