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Remove number one spark plug and squirt some motor oil into the cylinder. Now do another compression test. If the compression goes up considerably in number one cylinder you probably have bad/worn or cracked piston rings. If the compression doesn't change much you probably have burned or bent valves.

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Q: What causes a number 1 cylinder to have 50 psi and the others 150 psi on a 92 geo prizm 1.6l?
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