F 250 2WD Pickup V8-7.3L DSL (1990)
TEMPERATURE VACUUM SWITCH (TVS) - Used with some ported EGR systems. Located in the carburetor air cleaner to control vacuum to the
EGR valve. Responds to temperature of the inlet air heated by the exhaust manifold. Looks like a cold weather modulator, differentiated by color.
THERMACTOR - An air injection type of exhaust emission control system. A product identification name of Ford Motor Company.
THERMACTOR II - See pulse air system.
THERMACTOR AIR BYPASS SOLENOID (TAB) - Electrical Solenoid or its control line. Solenoid switches engine manifold vacuum. Vacuum
bypasses thermactor air to atmosphere.
Thermactor Air Control Solenoid Vacuum Valve Assembly
THERMACTOR AIR CONTROL SOLENOID VACUUM VALVE ASSEMBLY - Used on thermactor air control system, the valve assembly consists
of two normally open solenoid valves with vents.
THERMACTOR AIR CONTROL VALVE - Combines a bypass (dump) valve with a diverter (upstream-downstream) valve. Controls the flow of
thermactor air in response to vacuum signals to its diaphragms.
TAB and TAD Solenoids
THERMACTOR AM DIVERTER SOLENOID (TAD) - Electrical solenoid or its control line. Solenoid switches engine manifold vacuum. Vacuum
switches thermactor air from downstream (past EGO sensor in exhaust system) to upstream (before EGO sensor) when solenoid is energized.
THERMACTOR IDLE VACUUM VALVE (TIV)
-
Used in some evaporative emission systems to improve engine idling after a hot start.
THERMAL REACTOR - Exhaust manifold design using heat and air to burn unburned hydrocarbons in the exhaust gases in order to reduce air
pollution.
THERMACTOR VACUUM AND VENT CONTROL VALVE - VACVVT.
THERMAL VENT VALVE (TVV) - Temperature sensitive valve assembly located in the canister vent line. Closes when engine is cold and opens when
hot. Prevents fuel tank vapors from being vented through the carburetor fuel bowl when fuel tank heats up before engine compartment.
THREE-WAY CATALYST (TWC) - (1) A catalyst designed to convert hydrocarbons, carbon monoxide and oxides of nitrogen into harmless
substances. Only effective when the exhaust gases are chemically correct, that is, when the air/fuel ratio of the mixture burned in the cylinders is 14:6:1.
See also "stoichiometric". (2) Sometimes referred to as a dual catalytic converter Combines two converters in one shell. Controls NO(x), HC and CO.
Throttle Kicker Actuator
