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Air injection

Does anyone know what wires, components, gadjets I need to check on my 2000 Ford Taurus F/F car for a “secondary Air Injection System” problem?

The system is passive, an air manifold usually fed from the air cleaner (but not always) then an “anti-backfire valve” to prevent hot exhaust from blowing back into the air cleaner, then either separate tubes leading into each exhaust port or a single tube feeding into the catalytic converter. Some systems feed BOTH the ports and converter. In older cars, an air sump (smog pump) was used to force the air into the system. In newer systems, the air is drawn in by creating a negative pressure pulse in the exhaust so no pump is needed. Today, few cars still use air injection as part of their emissions controls.