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Message: [QUOTE="sonic blue l, post: 1070095, member: 5185"] The next step would be a manual compression test, if the relative passed and showed the same after a few tries, then realistically you could get away with only doing one cylinder on each bank. (Help keep costs down) If the op doesn't know, basically a relative compression test is the scan tool monitoring crankshaft speed while the engine is cranked over (without running) thus a low compression cylinder will cause a speed increase in the crankshaft). This is why it's called relative as it only compares the cylinders to one another, but does not actually tell you what the compression is. This is why you can have a worn out/dusted engine that will pass a relative compression test. Now have a hole in a piston, damaged valves, broken rocker arm , etc and it will flag that cylinder. (Well in theory as I've had it pick the wrong cylinder before, but that's not that's not really the point as a failure of relative just means one should perfom a manual test to verify, just like how high crankcase pressure needs to be verified with a manual compression to either condem or rule out base engine) [/QUOTE]

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