THERMACTOR I System: Description

NOTE: Some Federal models equipped with the 200" 6-cylinder engine and automatic transmission are equipped with a pulse air type air injection system. See FORD MOTOR CO. THERMACTOR II PULSE AIR SYSTEM article in this section.

NOTE: For complete Thermactor I information on 1975-77 Ford models without Catalytic Converter, see the Air Injection Systems - Exc. Ford W/Cat. Converter article at beginning of this section.

The Thermactor I exhaust control system reduces carbon monoxide and hydrocarbon content of exhaust gases, by injecting fresh air into the exhaust gas stream as it leaves the combustion chamber. System consists of the following components: Air supply pump, air by-pass valve, vacuum differential valve (not used on all models), air supply system (external or internal), cylinder heads with air passages to exhaust ports, exhaust check valve(s), vacuum reservoir (some models), cold engine lockout/overheat protection system (1975-77 only), air pump muffler (some models with 302"), and a vacuum vent valve (2700 VV carburetor only).

NOTE: Thermactor air may also be injected into the catalytic converter on systems equipped with the Three-Way Catalyst (TWC). See Ford Motor Co. Feedback Carburetor Electronic Engine Control System and Electronic Engine Control (EEC I or EEC II) system articles in COMPUTERIZED ENGINE CONTROLS section for additional information.