A leakage test can also be used in conjunction with a compression test to diagnose other kinds of problems. You can combine tests to help figure out the problem, so don't rule out compression test.Originally Posted by no mo hondas
leak down test: Air coming out of the breather vent or PCV valve fitting would tell you the rings and/or cylinders are worn. Of course it's more to it.
Compression test: If the psi are low it's either blown head gasket, bent valve, burnt valve etc...




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