Catalytic Converters
Check Engine Light
Chevy Blazer S-10
Chevy Trailblazer

What is a secondary air injection malfunction?

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Wiki User
December 22, 2006 3:14PM

The secondary air injection pump pumps air into the exhaust to help heat the catalytic converter at cold start. This lowers the emissions at an otherwise high emission time. A malfunction means that computer has registered either a pump failure (common on some models), fuse blown, or improper catalytic converter function. has a diagram of this part, how it works etc.