Reply to "Cylinders 3 & 4 read low during compression check"

If it is a blown head gasket between #3 and #4 then a leak down test might be misleading. It could show that both cylinders are healthy if the valves are closed on both cylinders when the test is done. If one of the valves in the neighboring cylinder are open during the test then you would hear air coming out the tail pipe or intake.

8/15/227:41 AM

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