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Im not sure a snap on scanner is capable of doing a proper buzz test on one of our trucks...Unless it has powerstroke specific software... If it is it should do it in order... 1-8 i believe.
they test 1 thru 8 in numerical order snap-on or ford's ids/ngs scanners, if you replace the injector replace the under valve cover harness and valve cover gasket to prevent problems down the road