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I have read numerous posts on the secondary air system and its parts. I have inspected the system on my '97 Boxster. When the ignition is turned on, I hear a buzzing sound from a source under the intake manifold. I am guessing this is the electric change over valve. The air injection pump does not come on.

Does anyone have a step by step procedure for replacing the valves in the sec. air system? it looks like the passenger side manifold needs to come off, but I'm hoping that is not the case.

Any assistance will be appreciated.

zok

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I should check the fuses/connectors and wiring first and than dismantling the engine, a guess is still a guess.

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