It will allow you to perform the same diagnostics a Ford dealer tool can.
Where you located? Someone may have one nearby and be able to help...
__________________ Excursion & 6.7 Forum ModDeath Row Inmate #21 The Monster: 2005 Ford Excursion Limited, 4wd "The 6.0" Bulletproofed by Powerstroke Enginuities Straight pipe, Atlas 40, Heavily RiffRaff'd, and Gearheaded Rudolph: 2001 Ford Excursion Limited, 2wd, "The 7.3" Built with blood and sweat by Me and Riffraff Diesel, heavily modded, also Gearheaded FTE Guidelines
There is no easy way to fully test bad cylinders, but good indication can be temperature measurements. I've been using infra-red thermometer and right now you can buy one for $9, while $25 buys one with laser pointer. When you spot cylinder more than 40F colder than the rest, you have a mis performing one. Usually I measure temperatures of exhaust manifold, since on newer engines the top of cylinder is not accessible.
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