Air Check Valve

Posted in the Chevrolet Impala Forum

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PatJ

Saranac Lake, NY

I have a 2001 Impala LS, recently started knocking, no power, no o/d - then discovered the air check valve was gone, all melted, except for the spring. What would cause something like this to happen ?

Technician R

Galena, OH

PatJ wrote:

I have a 2001 Impala LS, recently started knocking, no power, no o/d - then discovered the air check valve was gone, all melted, except for the spring. What would cause something like this to happen ?

Probable faulty check valve at the catalytic converter air pipe allowing hot exhaust gas to back up into air management system melting your air check switching valve.

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