T
TEMPERATURE ACTUATED VACUUM - TAVTEMPERATURE COMPENSATED
[ACCELERATOR] PUMP (TCP) - A temperature compensated (rate-sensitive) pump allows a large pump capacity to facilitate cold engine requirements and a smaller capacity during warm engine operation. The design incorporates an electric solenoid controlled vacuum valve "bypass bleed" for fuel returned to the fuel bowl.
Temperature Vacuum Switch:
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:
THROTTLE KICKER ACTUATOR (TK) - A device that moves throttle linkage to adjust idle rpm. This can be accomplished by various electromechanical systems. On some EEC-IV applications, an electric solenoid, controlled by the processor, supplies manifold vacuum to the throttle kicker to adjust the idle.
THROTTLE KICKER SOLENOID (TKS) - Electrical solenoid or its control line. Solenoid when energized supplies manifold vacuum to throttle kicker actuator as directed to the ECA. Actuator moves throttle linkage to increase idle rpm. TKS vents the actuator vacuum line when de-energized.
Throttle Position Sensor:
THROTTLE POSTION SENSOR (TP). Potentimetric sensor or its signal line. Sensor wiper position is proportional to throttle position.
Defines engine operation mode: closed, part or wide open throttle, also throttle angle rate for accelerator pump function (replaces carburetor spark/ERG port). There are two types of throttle positioners:
rotary and linear (Tempo and Topaz only).
TRANSMISSION REGULATED SPARK CONTROL SYSTEM (TRS or TRS + 1) - A distributor vacuum control system aiding in more complete fuel combustion by regulating spark retard when the outside air temperature is above 60~F. The system uses a switch responding to the gear range, or hydraulic pressure in the transmission, to regulate a vacuum control valve.
TSP VACUUM OPERATED THROTTLE MODULATOR - TSP-VOTM
TURBO BOOST ACTUATOR (BOOST) - An output of the ECA which insures that no boost will be applied until certain engine conditions have been met.