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Answer by Solar Mike for Compression test

When you changed the piston rings you did check the bores for ovality and scoring and honed them so the new rings would seal properly. Or did you just fit new rings...That may explain the difference...

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Compression test

I have a 2002 Toyota Corolla (1zz-fe engine with 236k miles on it) and did a compression test on a warm engine. My readings are:150 - 150 - 140 - 175I've read that the difference should not be more...

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