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Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
Chapter 6 86
THERMACTOR AIR BYPASS SOLENOID – Solenoid
switches engine manifold vacuum. Vacuum reacts on
thermactor bypass valve to bypass thermactor air to the
atmosphere. Used on Ford MCU feedback carburetor system.
THERMACTOR AIR CONTROL VALVE – Combines
function of a normally closed air bypass valve and an air
diverter valve in one integral valve.
THERMACTOR AIR DIVERTER SOLENOID – Solenoid
switches engine manifold vacuum. Vacuum switches
thermactor air from downstream (past EGO sensor) to
upstream (before EGO sensor) when solenoid is energized.
Used on Ford MCU feedback carburetor system.
THERMACTOR AIR SYSTEM – Efficiency of catalytic
converter is dependent upon temperature and chemical
makeup of exhaust gases. These requirements are met by the
thermactor air supply system.
THREE-WAY CATALYST – Combines 2 converters in 1
shell. Controls NOx, HC and CO. Also called dual catalytic
converter.
TIMING – Relationship between spark plug firing and piston
position.
TK – Throttle Kicker solenoid, when energized, supplies
manifold vacuum to throttle kicker actuator as directed by
computer to compensate for engine loads. Also called idle-up
system.
TOT – Transmission Oil Temperature sensor.
TP – Throttle Position sensor or its circuit. Used to signal
computer the position of the throttle plates.
TPI – Tuned Port Injection, a type of MFI with intake tubes
designed to be tuned for performance. Most TPI engines are
also SFI.
TTS – Transmission Temperature Switch.
TVS – Temperature Vacuum Switch.
TVV – Thermal Vent Valve.
TWC – Three-Way Catalyst.
VACUUM – A term to describe a pressure that is less than
atmospheric pressure.
VACUUM ADVANCE – Advances ignition timing with
relation to engine load or computer signals.
VAF – Vane Air-Flow sensor or its circuit.
VAT – Vane Air-Flow Temperature sensor.
6
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