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: Compression Test and Engine Troubleshoot fowheelerman 05-17-2010, 10:03 PM i am having some engine knoises and i want to test both the injectors and the compression. I have EFI Live but i am not sure as to how i can turn off each injector individually to listen for a change in sound as well as how would i perform a compression test? Thank you. Rader2146 05-17-2010, 11:08 PM EFI Live Scan Tool --> DVT (F12) Tab --> Underneath "Target Controller", select the "Control" Tab --> Start Engine, Connect to Vehicle (Ctrl+F3), Activate, then select injector to turn off. Compression test is done through the glow plug hole. fowheelerman 05-17-2010, 11:28 PM awesome thank you how much compression should i read and do you have any part #'s for a gauge to buy? Rader2146 05-18-2010, 01:34 AM Sorry, not a clue. :D The extent of my knowledge of DMAX compression tests is that its done in the glow plug hole, what happens after that....:confused::o: Shadow1 05-18-2010, 10:00 AM I've not done a compression test on my Duramax, but here's GM's procedure plus a couple of posts I saved: | ||