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QUESTION:

1998 Ford Ranger 2.5 four cylinder. compression on #1-3 160lbs. #4 0lbs. Removed Head head gasket OK. Had head magnufluxed & pressure tested OK had a valve job done at machine shop. head back on truck #1-3 160lbs comp. #4 0-lbs I’m lost on what to do. Already Tried:
ran compression check cyl1-3 have160 psi compression cyl-4 has o psi.Removed head gasket ok had valve job done and pressured tested. Put head back on. ran comp test same results as before. Piston showed no damage cylinder walls showed no damage ether.

ANSWER:

You have taken the right steps so far. About the only thing left, after ruling out the head and gasket, that would cause this would be a cracked piston ring or piston(where you can’t see it). This will require removing the piston and rod assembly for inspection.

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