- A -

AB - Air Bleed

ABDC - After Bottom Dead Center

ABPV or ABV - Air Bypass Valve

ABS - Anti-lock Brake System

AC - Alternating Current

A/C - Air Conditioner or Air Conditioning

ACCC - A/C Compressor Clutch

ACCCS - A/C Clutch Cycling Switch

ACL BI-Met - Air Cleaner Bimetal sensor

ACL DV - Air Cleaner Duct and Valve Vacuum motor

ACT - Air Charge Temperature sensor

ACV - Air Control Valve

ADS - Association of Diesel Specialists

AEA - Automotive Electric Association

AERA - Automotive Engine Rebuilders Association

A/F - Air/fuel

AFB - Aluminum Four-Barrel (carburetor)

AFC - Air-Flow Controlled

AFR - Air/fuel ratio

AFS - Air Flow Sensor

AI - Air Injection

AICV - Air Injection Check Valve

AIR-CHV - Air Check Valve

AIR-DV - Air Diverter Valve

AIR-IVV - Air Idle Vacuum Valve

AIS - Air Injection System

AIS - Automatic Idle Speed Motor

AIV - Air Injection Valve

AMGV - Air Management Valve

AMS - Air Management System

ANTBV - Anti-Backfire valve

APDV - Air Pump Diverter Valve

API - American Petroleum Institute

AS - Airflow Sensor

ASC - Automatic Stability Control

ASE - Automotive Service Excellence

ASIA - Automotive Service Industry Association

ASME - American Society of Mechanical Engineers

ASRV - Air Switching Relief Valve

ASS - Air Switching Solenoid

ASV - Air Switching Valve

ATA - American Trucking Association

ATF - Automatic transmission fluid

ATS - Air Temperature Sensor

AWD - All-wheel-drive

- B -

BBDC - Before Bottom Dead Center

BCDD - Boost-Controlled Deceleration Device

BCI - Battery Council International

BDC - Bottom dead centerBhp - Brake horsepower

BHS - Bi-Metal Heat Sensor

BMAP - Barometric and Manifold Absolute Pressure sensor

BP - Barometric Pressure sensor

BPA - By-Pass Air solenoid

BPEGR - Backpressure

EGRBPS - Barometric Pressure Sensor

BTU - British Thermal Unit

BV - Bowl Vent port

BVT - Backpressure Variable Transducer

- C -

C-3 - Computer Command Control system

C-4 - Computer Controlled Catalytic Converter system

CAM - Choke Air Modulator switch

CANP - Canister Purge solenoid

CAS - Cleaner Air System

CAT - Catalytic Converter

CAV - Coasting Air Valve

CBVV - Carburetor Bowl Vent Valve

CC - Catalytic Converter

CCC - Computer Command Control; Converter Clutch Control solenoid

CCEGR - Coolant Controlled Exhaust Gas Recirculation

CCEVS - Coolant Controlled Engine Vacuum Switch

CCIE - Coolant Controlled Idle Enrichment

CCO - Converter Clutch Override

CCS - Controlled Combustion System

CCT - Computer Controlled Timing

CCV - Closed Crankcase Ventilation system

CEC - Combined Emission Control system; Computerized Emission Control system; Combination Emission Control

CES - Clutch Engine Switch

CI - Cubic Inches

CID - Cubic Inch Displacement

CIS - Continuous Injection System

CKV - Check Valve

CLC - Converter Lock-up Clutch

CO - Carbon Monoxide

CO2 - Carbon Dioxide

COC - Conventional Oxidation Catalyst

CP - Crankshaft Position sensor

CPRV - Canister Purge Regulator Valve

CPS - Canister Purge Solenoid

CPV - Canister Purge Valve

CRV - Coasting Richener Valve

CSOV - Canister purge Shut Off Valve

CSSA - Cold Start Spark Advance system

CSSH - Cold Start Spark Hold system

CTAV - Cold Temperature Activated Vacuum

CTO - Coolant Temperature Override switch

CTS - Coolant Temperature Sensor; Coolant Temperature Switch

CTVS - Choke Thermal Vacuum Switch

CV - Check Valve

CWM - Cold Weather Modulator

- D -

DBC - Dual-Bed Catalytic Converter

DC - Direct current

DEFI - Digital Electronic Fuel Injection

DFS - Deceleration Fuel Shut-off

DIS - Distributorless Ignition System

DLV - Delay Valve

DP - Dashpot

DPDT - A double-pole, double-throw switch

DPST - A double-pole, single-throw switch

DRB II - Diagnostic Readout Box II

DS - Detonation Sensor See knock sensor

DSAV - Deceleration Spark Advance system

DV - Delay Valve

DVOM - Digital Volt-Ohmmeter

DVTRV - Diverter Valv

- E -

ECA - Electronic Control Assembly

ECC - Electronic Controlled Carburetor

ECM - Electronic Control Module

ECS - Evaporation Control System

ECT - Engine Coolant Temperature sensor

ECU - Electronic Control Unit

EDIS - Electronic Distributorless Ignition System

EDM - Electronic Distributor Modulator

EEC - Evaporative Emission Controls

EEC/EEC-I/EEC-II/EEC-III/EEC-IV - Electronic Engine Control systems

EEGR - Electronic

EGR valve

EFC - Electronic Feedback Carburetor; Electronic Fuel Control

EFE - Early Fuel Evaporation

EFE TVS - EFE Thermal Vacuum Switch

EFI - Electronic Fuel Injection

EGO - Exhaust Gas Oxygen sensor

EGR-EPV - EGR External Pressure Valve

EGR-EVR - EGR Electronic Vacuum Regulator

EGR-FDLV - EGR Forward Delay Valve

EGR-RSR - EGR Reservoir

EGR-S/O - EGR Shut-OffEGR-TVS - EGR Thermal Vacuum Switch

EGRV - EGR Vent solenoid

EGR-VCV - EGR Vacuum Control Valve

EGR-VSOL - EGR Vacuum Solenoid

EGR-VVA - EGR Venturi Vacuum Amplifier

EHCV - Exhaust Heat Control Valve

EIS - Electronic Ignition System

ELB - Electronic Lean Burn

EMF - Electromotive Force, or Electromagnetic Frequency

EPA - Environmental Protection Agency

EPC - Electronic Pressure Control

EPR-SOL - Exhaust Pressure Regulator Solenoid

EPR-VLV - Exhaust Pressure Regulator Valve

ERS - Engine Rpm Sensor

ESC - Electronic Spark Control system

ESS - Engine Speed Sensor

ESSM - Engine Speed Switch Module

EST - Electronic Spark Timing system

ETC - Electronic Throttle Control

EVAP - Evaporative emission control system

EVCR - Emission Vacuum Control Regulator

EVP - EGR Valve Position sensor

EVR - EGR Vacuum Regulator

- F -

FAP - Forced Air Pre-heat system

FBC - Feedback Carburetor system

FBCA - Feedback Carburetor Actuator

FCS - Feedback Carburetor Solenoid; Feedback Control System; Fuel Control Solenoid; Fuel Control System

FCV - Fuel Cut-off Valve

FI - Fuel Injection

FVEC - Fuel Vapor Emission Control

FVR - Fuel Vapor Recovery system

- H -

HAC - High altitude compensator

HAEC - High Altitude Emission Control system

HAI - Heated Air Inlet system

HC - Hydrocarbon

HCV - Heat control valve

HEGO - Heated EGO sensor

HEI - High Energy Ignition

HSC - High Swirl Combustion chamberWoman looks for answers in her Haynes Manual

- I -

IAC - Idle Air Control

IAS - Inlet Air Solenoid Valve

IAT - Intake Air Temperature

IBP - Integral Back Pressure

ICM - Ignition Control Module

ID - Inside diameter

IGN - Ignition

IHP - Indicated Horsepower

IMVC - Intake Manifold Vacuum Control

INJ - Injector

INJ GND - Injector Ground

ISS - Idle Stop Solenoid

ITC - Ignition Timing Control system

ITS - Idle Tracking Switch

IVV - Idle Vacuum Valve

- J -

JAS - Jet Air Stream

JCAV - Jet-Controlled Air Valve

JVS - Jet Valve System

- K -

KAM - Keep Alive Memory

KNK - Knock Sensor

KS - Knock Sensor

- M -

MAF - Mass Air Flow Sensor

MAJC - Main Air Jet Control

MAT - Manifold Absolute Temperature Sensor

MCS - Mixture Control System

MCT - Manifold Charge Temperature Sensor

MCU - Microprocessor Control Unit

MEC - Motronic Engine Control

MECS - Mazda Equipped Control System

MEMA - Motor and Equipment Manufacturers Association

MEWA - Motor and Equipment Wholesalers Association

MFI - Mechanical Fuel Injection, or Multi-port Fuel Injection

MHCV - Manifold Heat Control Valve

MIL - Malfunction Indicator Light

MPFI - Multi-Point Fuel Injection

MTA - Managed Thermactor Air

MVMA - Motor Vehicle Manufacturers Association

- N -

NADA - National Automobile Dealers Association

NAPA - National Automotive Parts Association

- O -

OC - Oxidation Catalyst

OHV - Overhead Valve

OS - Oxygen sensor

OSAC - Orifice Spark Advance Control

OSHA - Occupational Safety and Health Administration

OTVS - Oil Thermal Vacuum Switch

OXS - Oxygen Sensor system

- P -

PA - Pulse AirPACV - Pulse Air Check Valve

PAF - Pulse Air Feeder

PAI - Pulse Air Injection

PAS - Pulse Air System

PCOV - Purge Control Valve

PCV - Positive Crankcase Ventilation system

PCVS - PCV Solenoid

PCVV - Positive Crankcase Ventilation Valve

PECV - Power Enrichment Control Valve

PFE - Pressure Feedback

EGR sensor

PFI - Port Fuel Injection

PIP - Profile Ignition Pickup

PROM - Programmable Read-Only Memory

PSOV - Canister Purge Shut-Off Valve

PSPS - Power Steering Pressure Switch

PSV - Pulse Air Shut-off Valve

PTC - Positive Temperature Coefficient choke heater

PVA - Ported Vacuum Advance

PVCS - Ported Vacuum Control System

PVFFC - Pressure/Vacuum Fuel Filler Cap

PVS - Ported Vacuum Switch

- R -

RAM - Random Access Memory

RC - Rear Catalytic Converter

RDV - Retard Delay Valve or Reverse Delay Valve

RMA - The Rubber Manufacturers Association

ROM - Read Only Memorycar gets a full inspection- S -

SAE - Society of Automotive Engineers

SAS - Secondary Air Supply system See “Air Injection System.”

SBC - Single Bed Catalytic converter; Small Block Chevy

SCC - Spark Control Computer

SCS - Spark Control System, or Speed Controlled Spark

SCVAC - Speed Control Vacuum Control

SDV - Spark Delay Valve

SEC ACT - Secondary Actuator

SEFI - Sequential Electronic Fuel Injection

SFI - Sequential Fuel Injection

SHED - Sealed Housing Evaporative Determination system

SIL - Shift Indicator Light

SIS - Solenoid Idle Stop

SOL

V -

EGR Solenoid Vacuum Valve Assembly

SPFI - Single-Point Fuel Injection

SPDT - Single-Pole, Double-Throw Switch

SPST - Single-Pole, Single-Throw Switch

SRS - Supplemental Restraint System (airbag)

SSI - Solid State Ignition system

SVCBV - Solenoid Valve Carburetor Bowl Vent

SVV - Solenoid Vent Valve

- T -

TAC - Thermostatically Controlled Air Cleaner

TAD - Thermactor Air Diverter Solenoid

TAV - Temperature Activated Vacuum System

TBI - Throttle Body Injection

TPMS - Tire Pressure Monitor System

TC - Throttle Closer

TCAC - Thermostatic Controlled Air Cleaner System

TCC - Transaxle Converter Clutch system

TCS - Throttle Control System; Transmission Converter Switch; Transmission Controlled Spark

TDC - Top Dead Center

TDP - Throttle closing Dashpot

TDS - Time Delay Solenoid

TEC - Thermactor Exhaust Control system

TES - Thermal Electric Switch

TFI, TFI-IV - Thick Film Integrated Ignition (Ford systems)

TIC - Thermal Ignition Control

TIV - Thermactor Idle Vacuum valve

TK - Throttle Kicker

TKA - Throttle Kicker Actuator

TKS - Throttle Kicker Solenoid

TO - Thermal Override

TOC - Throttle Opener Control system

TP - Throttle Position; Throttle Position Sensor

TPI - Tuned Port Injection

TPS - Throttle Position Sensor

TR - Thermal Reactor

TSD - Throttle Solenoid

TSP - Throttle Solenoid Positioner

TVS - Temperature Vacuum Switch; Thermal Vacuum Switch

TVSV - Thermostatic Vacuum Switch Valve

TVV - Thermal Vacuum Valve;

TVV Thermal Vent Valve

TWC - Three-Way Catalyst

- U -

UBC - Underbody Catalyst

- V -

VAC - Vacuum Advance Control

VAF - Vane Air Flow meter

VAT - Vane Air Temperature sensor

VAV - Vacuum Advance Valve

VB - Vacuum Break

VBV - Vacuum Bias Valve

VCKV - Vacuum Check Valve

VCS - Vapor Control System; Vacuum Control Switch

VCV - Vacuum Control Valve

VDV - Vacuum Delay Valve; Vacuum Differential Valve

VECI - Vehicle Emission Control Information Decal

VHC - Vacuum Operated Exhaust Heat Control Valve

VIN - Vehicle Identification Number

VMV - Vacuum Modulator Valve

VOC - Volatile Organic Compounds

VOM - Volt-Ohmmeter

VOTM - Vacuum-Operated Throttle Modulator

VP - Vacuum PumpVRDV - Vacuum Retard Delay Valve

VRESER - Vacuum Reservoir

VREST - Vacuum Restrictor

VR - Variable Reluctance Sensor

VR/S - Vacuum Regulator Solenoid

VRS - Variable Reluctance Sensor

V-RSR - Vacuum Reservoir

V-RST - Vacuum restrictor

VRDV - Vacuum Retard Delay Valve

VRES - Vacuum Reservoir

VREST - Vacuum Restrictor

VRV - Vacuum Reducer Valve; Vacuum Regulator Valve

VS - Vacuum Switch

VSA - Vacuum Switch Assembly

VSC - Vehicle Speed Control Sensor

VSS - Vehicle Speed Sensor; Vacuum Switch Solenoid

VSV - Vacuum Solenoid Valve; Vacuum Switching Valve

VTM - Vacuum Throttle Modulator

VTP - Vacuum Throttle Positioner

VTV - Vacuum Transmitting Valve

VVA - Venturi Vacuum Amplifier

VVC - Variable Voltage Choke

VVT - Variable Valve Timing

VVV - Vacuum Vent Valve

- W -

WAC - Wide-Open Throttle Air Conditioner Cutoff

WOT - Wide-Open Throttle

WOTS - Wide-Open Throttle Switch

WOTV - Wide Open Throttle Valve