1990 Ford Bronco 5.8L Thermactor Air Pump & Bypass Valve Location Diagram

This document is a Ford factory-style line drawing (figure reference A9394-B) showing the Thermactor secondary air injection system components on a Ford V8 engine equipped with Electronic Fuel Injection, as indicated by the 'Ford Electronic Fuel Injection' lettering on the upper intake manifold. The illustration is a front three-quarter perspective view of the engine with an arrow labeled 'FRONT OF ENGINE' establishing orientation. Callout arrows identify four key emissions components and their mounting locations: the Air Bypass Valve (mounted high on the driver's side near the intake), the Thermactor Dump Silencer (located low on the front driver's side of the engine), the Air Pump Inlet Silencer/Filter (mounted at the lower front of the engine ahead of the air pump), and the Pump Assembly (the belt-driven Thermactor air pump with pulley at the lower passenger side front of the engine). The drawing contains no text tables, torque values, wire colors, or part numbers other than the figure number, and it does not state a model year or specific engine displacement. It was uploaded as part of a set of 1990 Ford Bronco emissions documents and is claimed to apply to the 5.8L engine.