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Many reasons. Did you take the plug out of #4?

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โˆ™ 2010-03-17 03:01:42
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Q: Why would a 93 corolla have 190psi compression on three cylinders and 0psi on the forth cylinder?
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The repair depends on what is causing the low compression. Low compression can be caused by a blown head gasket, cracked cylinder head, burnt or damaged valves, worn or cracked piston rings, scored block cylinders. It's kind of hard to imagine that an engine would have low compression on all 6 cylinders unless something major is wrong, or the compression gauge is not measuring properly.


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Is the head bad if there is no compression or is it the oil pump that operates the lifters on a 1988 323?

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