No compression cylinder number six

2011 CHEVROLET AVALANCHE
114,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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What causes no compression?
Jul 12, 2017 at 5:16 AM
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HMAC300
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a couple of things; a burnt valve or broken valve spring or a bad piston with a hole in it or burnt through as well as broken rings. See pictures.
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Jul 12, 2017 at 6:44 AM