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bad valve, bad rings or head gasket. need to do a leakdown test and see where the cylinder is leaking. do a copression test with adding a tablespoon of oil in the plug hole. if you get some compression, it's rings. have same problem with 5.0 in f150. mine bad rings on one cylinder. probable cause would have started with a bad injector leaking fuel and washing oil from the cylinder. then on restart that bore would not be lubed causing premature ring wear. at 150k, time for a new engine.

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Q: What causes no compression to just one cylinder 5 Got a 98 Explorer that has fuel and spark but no start Tested compression by hand and 5 has NO compression Reasons why Repairable?
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