Quote Originally Posted by niky View Post
Ah. I get it. It checks starter power usage to check which cylinders are "harder" to crank, and infers relative compression from that. So it's not an actual compression test... just a comparison. (Shrug)... probably okay... not as informative as a full compression test (which would show you if all cylinders are low) or a leakdown... but relative compression is actually what you're usually looking at when performing this test, anyway.
i have this machine to quickly isolate the problem ,so by doing a relative compression test ( that takes less than five minutes of my time , same as diesel engines 4 cyl. or 8 cyl.) i will be able to focus into some other systems

just imagine how long does it take to do a diesel compression test. specially V8'S

the reason why the high ignition pick-up is hooked -up to plug wire #1 is to be able to pinpoint which cyl . is not performing properly