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big mike

big mike 5/3/2012

1995 Lexus SC400 Base 8 Cyl 4.0L


What's a good way to find out if my car has a burnt valve without taking heads off car?

The car skips really bad it sounds like a helicopter

1 Answer


CVO 5/3/2012

The diagnosis of a burned valve is usually the result of a compression test. If a cylinder shows little or no compression, it frequently means the exhaust valve is not sealing. The valve may or may not be actually burnt (melted), but have other physical damage such as cracks or areas where pieces of metal are missing or eroded away from the valve face.

Obtain a compression tester ( loan free ) at the the local auto parts stores such as Autozone or O'Reilly and run a test.


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