what compression levels does a motor need a rebuild?

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04-09-2010, 03:00 PM

rcantu

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please close

thanks

Last edited by rcantu; 04-10-2010 at 01:47 AM.

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04-09-2010, 03:05 PM

03BRG

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If you have any questions find a shop that can do a leak down test. That way you can pin point bad valves bad rings the compression test only tells you part of the story.

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04-09-2010, 03:24 PM

rcantu

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thanks. i also read it could be the cam as well. it still idles fine w zero misfires and no check engine light.

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04-09-2010, 06:02 PM

plasticknives

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For comparison, I just did a compression test on a stock block and head and came up with 175 170 180 181.

Even if 130 was normal, I would be concerned with the 30 psi variation between cylinders.

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04-09-2010, 09:11 PM

cmt52663

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yep -- all those numbers are too low, and they should be at least within 5 lbs across all cylinders.

a good leak down would be the way forward. head? rings? both?

sorry.

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