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Main thing to watch for is a cylinder that's way out of line from the others.


Or two adjacent cylinders showing lower readings.

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Squirt a little oil (not a whole lot) into the cylinder.


I would test first _without_ the oil squirt. Then, if you see a lower reading, by squirting some oil in that cylinder, you can better determine if its a ring / valve / head gasket problem. If the rings are leaky, squirting oil in the cylinder would dramatically increase the compression. If the problem were a valve, or head gasket then there shouldn't be much difference.

C/YA!
Jeff
'88 Trooper
2DR LWB 4ZE1 5SP
bone stock DD