What are the part numbers for the Ford TAB and TAD solenoids?

The TAB solenoid is E8AE-9H465-BA and the TAD solenoid is E8AE-9H485-AA, as labeled on the diagram.

What ports are on the Ford combination Thermactor valve?

It has an inlet from the air pump, vacuum port "S" (air control), vacuum port "D" (air bypass), vent holes, outlet "A" to the engine, and outlet "B" to the catalyst.

Where does the Thermactor check valve outlet go?

Per the diagram, free flow passes the rubber disc from the IN side and exits out to the exhaust manifold and/or catalytic converter.

What connections does the EVR have?

The EVR diagram shows one port to the EGR valve and another to source vacuum.

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Ford Thermactor Secondary Air Valves Diagram - AIRB AIRD TAB TAD EVR Check Valve

Emissions valve schematics: AIRB, AIRD, combination, TAB/TAD, check and EVR valves with ports

Secondary Air Valves & EVR (which has nothing to do with secondary air, but is a solenoid vacuum valve similar to the Thermactor Air Bypass & Thermactor Air Diverter, and is usually mounted beside them)

TAB & TAD solenoids should read 50-100 Ohms; each should hold vacuum applied to the source (farthest) nipple until 12V is applied across the solenoid terminals, at which point it should vent to the other nipple.
TAD pigtail
TAB pigtail

See also:
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Owner caption November 2021 · Photo 0 of 5000

This document is a labeled schematic reference sheet showing six Ford secondary air injection (Thermactor) and emissions-related valves. The AIRB (air bypass) valve is shown in two cutaway views identifying the vacuum nipple, inlet, outlet, polyester silencer, the AIRB/relief exhaust port (vent), and a connection for a remote dump. The AIRD (air diverter) valve diagram labels Outlet A, Inlet, and Outlet B. The COMBINATION valve view identifies the inlet from the air pump, vacuum port "S" (air control), outlet "B" to catalyst, vent holes, vacuum port "D" (air bypass), and outlet "A" to engine. The TAB/TAD section shows the Thermactor Air Bypass and Thermactor Air Diverter solenoids with part numbers E8AE-9H465-BA (TAB) and E8AE-9H485-AA (TAD), both individually and mounted as a pair on a bracket. The CHECK valve cutaway shows the rubber disc, the inlet (IN), free flow direction, and the outlet to the exhaust manifold and/or catalytic converter. The EVR (EGR Vacuum Regulator) diagram labels its ports to the EGR valve and to source vacuum, plus its schematic symbol. Readers can use this sheet to identify these valves, their ports, and flow directions for diagnosis or replacement.

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Frequently asked questions

What are the part numbers for the Ford TAB and TAD solenoids?: The TAB solenoid is E8AE-9H465-BA and the TAD solenoid is E8AE-9H485-AA, as labeled on the diagram.
What ports are on the Ford combination Thermactor valve?: It has an inlet from the air pump, vacuum port "S" (air control), vacuum port "D" (air bypass), vent holes, outlet "A" to the engine, and outlet "B" to the catalyst.
Where does the Thermactor check valve outlet go?: Per the diagram, free flow passes the rubber disc from the IN side and exits out to the exhaust manifold and/or catalytic converter.
What connections does the EVR have?: The EVR diagram shows one port to the EGR valve and another to source vacuum.
What internal parts are labeled on the AIRB valve?: The AIRB diagrams label a vacuum nipple, inlet, outlet, polyester silencer, the AIRB/relief exhaust port (vent), and a connection for a remote dump.