Thermactor Bypass/Diverter Valve
Used only on models equipped with Electronic Engine Control III (EEC III). Differs from standard type bypass valve in that it can route thermactor pump air to 3 different locations:
- Downstream (air is injected into the three-way catalyst).
- Upstream (air is injected into the exhaust manifold).
- Bypass (air is bypassed to the atmosphere).
Proper routing of thermactor air is determined by the Electronic Control Assembly (ECA) based on engine coolant temperature and other sensor data. For additional information, see Ford Motor Co. Electronic Engine Control III (EEC III) article in this section.