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i tried looking for normal ranges for the tach to move when doing this test but i didnt find anything, anyway here is a video of what my tach does during the test. although it seemed the first single injector buzz was about 150 rpm less it all passed.
it looks good..the first jump to 3k is all 8 injectors being tested at the same time..then the 1800-2000 jump is each injector be tested one at a time...