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Old 04-07-2004, 09:02 AM
LarryBible
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A compression test is only halfway to the mechanical diagnosis. Now you need to do either a wet compression test or a leakdown test to determine if the problem is with rings or valves.

120,000 miles, unless the engine has not been maintained with oil and filter changes, should have a very tight bottom so I don't think the added compression would bring the engine to its knees, especially that fast.

If putting a tablespoon of oil in each cylinder doesn't bring the compression up, then it is valves or head gasket. If it does it is rings/pistons/cylinders.

With a leakdown you will need to listen to tell where the leakage is. Through oil filler hole is rings, through intake manifold is intake valve, exhaust is exhaust valve or around head gasket is head gasket.

Good luck,
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