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michael Posted on Apr 11, 2014
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Low compression in two cylenders - 1999 Audi A6

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Brad Brown

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  • Audi Master 19,187 Answers
  • Posted on Apr 11, 2014
Brad Brown
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A compression test is only a partial diagnostic. You should have a cylinder leak down test done. Low compression could be valves, Rings, head gasket or cracked head or block. IT could also be nothing depending on how low it is. So a cylinder leak down test tells you which one it is. The mechanic hooks a pressure hose to the spark plug hole, air pressure is put in the cylinder when the valves are closed. The location of the leak can then be heard.

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1999 A6

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