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Bad: Rings, Valves, Head Gasket, cam shaft (cam shaft timing) - Cracked Head, Piston, Cylinder -- just to name a few things.

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Q: What would cause 2 cylinders to have low compression in a 89 Isuzu trooper compresion test came out 1 100 2 20 then wet test went to 40. 3 120 4 0 then wet test 20?
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