relative compression

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yarttam

relative compression

Post by yarttam » Sat Apr 17, 2010 11:33 pm

I used pico diagnostics to do relative compression on a 2000 Mits eclipse 3.0. It had been in a flood. Pulled plugs, turned motor by hand, (it had sat for 2 months). Plugs back in, and started car. Let it run for 5 mins or more, running rough. Then did pico compression test, key off, with start switch in place of start relay. I got different results every time. I haven't used this test much yet, although I plan too. Why the different test results?

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Matt Fanslow
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Location: MN

Re: relative compression

Post by Matt Fanslow » Wed May 26, 2010 4:54 pm

Is the engine turning over irregularly? Can you hear an RPM change?

Thanks.

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Re: relative compression

Post by Guest » Tue Jun 08, 2010 8:19 am

[quote="yarttam"] Then did pico compression test, key off, with start switch in place of start relay. I got different results every time. I haven't used this test much yet, although I plan too. Why the different test results?[/quote]


Did you do this test with WOT. I made the mistake a few times when first doing this test of not depressing the pedal and the results where varied each time I performed the test.

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