How to chek for blowby

Idwitheld-1` said:

pull the oil fill cap while its running. If it blows your hair back you got blow by.

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HISSIN50 said:

disregard my first post - i am obviously wrong; Id (how ya been bud?) has the correct answer.

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Idwitheld-1` said:

Glad I can be entertaining.

A leak down test is a valid test.


My original answer is a gross test. I have seen blow by so bad the PCV valve chattes with every cylinder compression pulse and the pressure out of the oil filler would actually blow your hair back.

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