A pattern used to grind pistons in an oval or cam shape.
A popular term for electronic mail.
An abbreviation for erasable programmable read-only memory.
A popular term for Englishtown.
A fuel blend of 85% ethanol and 15% gasoline.
An abbreviation for each.
Early Apex
Getting to the inside of a turn sooner than usual.
Early Fuel Evaporation
A system that evaporates fuel in the intake manifold with the use of heat from the exhaust, or an electrical element to improve the engine's cold-running characteristics and to reduce emissions.
An abbreviation for electronic air suspension.
Easy Exit
A system that provides for easy entrance and exit of the vehicle by moving the seat all the way back and down. Some systems may also move the steering wheel up and to full retract.
An abbreviation for electronic brake control module.
A component of a General Motors electronically controlled brake system used on some of their car lines.
An abbreviation for electronic control assembly.
An abbreviation for electronic climate control.
An offset, such as a disc, used to convert rotary motion into reciprocation motion, as in a cam lobe.
Eccentric Bearing
A bearing that is thicker at the crown by a few ten thousandths of an inch.
Eccentric Shaft
The crankshaft of a Wankle engine.
A shaft with eccentric offsets, such as a camshaft.
A condition whereby two or more round parts or holes do not share the same central axis.
An abbreviation for:
Electronic computer control system.
Electronic concentrated control system.
Electronic constant control system.
An abbreviation for electronic controlled ignition.
An abbreviation for electronic control module.
A small compact car.
A device in a carburetor that reduces fuel consumption, particularly under heavy throttle.
Economy of Motion
Minimum effort required to do a task.
A dragster with a single, normally aspirated gasoline engine.
An abbreviation for:
Electronic control system.
Evaporative control system.
An abbreviation for:
Electronic controlled transmission.
Engine coolant temperature.
An abbreviation for engine coolant temperature sensor.
An abbreviation for electronic control unit.
Eddy Current
Currents induced in conducting materials by varying magnetic fields; considered undesirable because they represent loss of energy and cause overheating.
Edge Loading
A condition that exists when two parts rub together at their edges.
An abbreviation for electronic distributorless ignition system.
To check the correctness of data.
To change, as necessary, the form of data by adding or deleting certain characters.
A program permitting the user to create new data files or to alter existing data files.
An abbreviation for:
Evaporative emission control.
Electronic engine control.
An early Ford electronic engine control that only controlled ignition advance and retard.
An early Ford electronic engine control system that used a crank-mounted ignition sensor and electronic engine control unit.
An early 1980s Ford electronic microprocessor engine-control system.
A Ford electronic engine-control system using sequential port fuel injectors.
An abbreviation for evaporative emissions control system.
An abbreviation for:
Electronic fuel control.
Electronic feedback carburetor.
The output of energy divided by the input of energy, expressed in percentage.
An abbreviation for electronic fuel injection.
Egg Crate
A cross-hatch grille design.
An abbreviation for exhaust gas recirculation.
EGR System
An EGR valve, mounted on the intake manifold, that meters a small amount of exhaust gas into the intake manifold to dilute the air/fuel mixture. This keeps combustion temperatures below 2,500°F and reduces the formation of NOX. The amount of exhaust gas recirculated into the engine is only a few percent.
EGR Valve
An abbreviation for exhaust gas recirculation valve.
EGR Valve-Position Sensor
A potentiometer that keeps the engine control computer informed relative to the EGR valve position.
An abbreviation for the Environmental Hazards Management Institute.
An abbreviation for extremely hazardous substance.
An abbreviation for engine identification number.
An abbreviation for exposure limit.
Elapsed Time (ET)
The time it takes a vehicle to cover a given distance, usually from a standing start, recorded to the thousandths of a second.
Elastic Limit
The maximum stress a metal can withstand without exhibiting a permanent deformation on release of the stress.
Elastomeric Seal
A seal made of rubber or a similar material.
An abbreviation for electronic level control.
Slang for Cadillac Eldorado.
An abbreviation for electric.
Electric Assist Choke
A choke containing a small electric heating element to warm the choke spring.
Electric Brakes
A brake system having an electro-magnet and armature at each wheel to provide the braking action.
Electric Car
A vehicle having an electric motor as the power source.
Electric Current
The movement of electrons through a conductor.
Electric Defrosting
Use of electric-resistance heating coils to melt ice and frost off:
Rear windows.
Electric Engine-Cooling Fan
A 12-volt, motor-driven fan that is electrically controlled by either, or both, of two methods: an engine-coolant temperature switch (thermostat) and/or the air-conditioner select switch.
Electric Fuel Pump
A device having either a reciprocating Diaphragm or a revolving impeller operated by electricity to draw fuel from the tank to the fuel delivery system.
Electric System
Any of the systems and sub systems that make up the automobile wiring harnesses, such as the lighting system or starting and charging system.
Electric Vehicle
A vehicle having electric motors like a power source driven by on-board rechargeable batteries.
Electric Welding
A term often used for arc welding.
Electric-Drive Cooling fan
An engine-cooling fan driven by an electric motor.
An electrically controlled fan that cycles ON and OFF with the air conditioner control, if predetermined system and/or ambient temperatures are exceeded.
Electrochromic Mirror
A mirror that automatically adjusts the amount of reflectance based on the intensity of glare.
Death caused by electrical current through the heart, usually in excess of 50 ma.
A component of the electrical circuit that terminates at a gap across which current must arc.
A rod used in welding.
Electrohydraulic Pressure Actuator
A valve that will provide a continuous adjustment of fuel pressure in certain fuel-injection systems.
A substance in which the conduction of electricity is accompanied by chemical action.
Electrolytic Cell
A simple battery consisting of the container, two electrodes, and the electrolyte.
A device consisting of a ferrous-metal core and a coil that produces appreciable magnetic effects when an electric current exists in the coil.
Electromotive Force (EMF)
An element of matter that surrounds the nucleus and helps determine the chemical properties of an atom.
Electron Optics
Electronics that apply the behavior of moving electrons under the influence of electrostatic or electromagnetic forces to devices or equipment.
Electronic Air Suspension (EAS)
A suspension system having provisions to adjust to road and/or load conditions to ensure a comfortable ride. May also include automatic level control.
Electronic Brake Control Module (EBCM)
A system having a monitor at each wheel to sense conditions and feed an electrical impulse into an onboard computer to reduce sideways skidding during rapid braking action.
Electronic Climate Control (ECC)
A system used to regulate the temperature and humidity of a vehicle's cabin.
Electronic Computer Control System (ECCS)
A term used for electronic control assembly (ECA).
Electronic Control Assembly (ECA)
A device that receives signals, processes them, makes decisions, and gives commands. More commonly referred to as a computer.
Electronic Control Module (ECM)
An electronic device used to control some engine functions.
Electronic Control System (ECS)
An electronic device used to control certain electrical and engine operations.
Electronic Control Unit (ECU)
A digital computer that controls engine and transmission functions based on data that it receives from sensors, relative to engine rpm and temperature, air temperature, intake-manifold vacuum, and throttle position.
Electronic Controlled Ignition (ECI)
A term that often applies to an electronic ignition (EI) system.
Electronic Controlled Transmission (ECT)
A transmission that has electronic sensors to monitor throttle position, engine speed, torque converter turbine speed, and other drive-train operations that effect shifting, leading to fuel economy.
Electronic Cycling-Clutch Switch
An electronic switch that prevents the evaporator from freezing by signaling various electronic control devices when the evaporator reaches a predetermined low temperature.
Electronic Distributorless Ignition System (EDIS)
An obsolete term for an ignition system that relies on a computer to time and route the electrical spark to the proper spark plug at the proper interval. Now known as electronic ignition (EI) system.
Electronic Engine Control (EEC)
A system that regulates an engine's electrical functions.
Electronic Feedback Carburetor (EFC)
A carburetor that controls the air/fuel mixture according to commands from the engine control computer.
Electronic Fuel Control (EFC)
A fuel system that uses electronic devices to monitor engine functions to ensure that the proper air/fuel ratio reaches the combustion chamber for optimum engine performance under any operating condition.
Electronic Fuel-Injection System
A fuel-injection system that injects gasoline into a spark-ignition engine that includes an electronic control to time and meter the fuel flow.
Electronic Ignition (EI)
An ignition system where a solid state device has replaced mechanical breaker points.
Electronic Ignition System
An ignition system controlled by the use of small electrical signals and various semiconductor devices and circuits.
Electronic Leak Detector
An electrically (AC or DC) powered leak detector that emits an audible and/or visual signal when its sensor is passed over a refrigerant leak.
Electronic Level Control (ELC)
A device that automatically regulates the ride height of a vehicle under various load conditions.
Electronic Mail (e-mail)
The process of sending, receiving, storing, and forwarding messages in digital form over telecommunication facilities.
Electronic Spark Control (ESC)
A system that controls and governs the vacuum signal to the distributor to assure proper distributor retard-advance under various engine-load conditions.
Electronic Spark Timing (EST)
An electronic system that, based on input signals, provides the correct spark timing for a given engine condition.
Electronically Controlled Transmission (ECT)
A transmission that is electronically linked to the vehicle's electronic control system.
The branch of science pertaining to the study, control, and application of currents of free electrons, including the motion, emission, and behavior of the currents.
A process for depositing metal on a conductive surface that is made by the cathode in an electrolytic bath containing dissolved salts of the metal being deposited.
Electrostatic Shield
A shield that protects a device or circuit from electrostatic energy, but not necessarily from electromagnetic energy.
A substance that cannot be further divided; the smallest of matter.
Elephant Foot
A valve-adjusting screw having a ball that swivels when it contacts the valve stem.
Elephant Motor
The Chrysler Hemi 425 cid engine.
A series of matches between two cars at a time, the winner advancing to the next race.
The fastest drag car in its class.
The Chevrolet El Camino.
Elliot Axle
A solid-bar front axle on which the ends span the steering knuckle.
Elliptical Spring
A term used for leaf spring.
The stretching of a material.
The ability of a bearing to permit small dirt particles to sink into the bearing surface, thereby avoiding certain crankshaft scratches.
Embossed Gasket
A shim-type head gasket having a raised surface.
A condition whereby a part becomes hard and brittle due to excessive flexing.
Emergency Brake System
A brake system used for stopping a vehicle in the event of a malfunction in the means of operation and control of the service brake system.
Emery Paper
An abrasive-coated paper used for fine finishing.
An abbreviation for electromotive force.
Emission Controls
The components that are directly or indirectly responsible for reducing air pollution, including crankcase emissions, evaporative emissions, and tailpipe emissions.
Emission Standards
The federal-government-established emission and pollutant standards for all motor vehicles because of environmental damage in the past.
Unwanted, harmful chemicals and chemical compounds that are released into the atmosphere from a vehicle, especially from the tailpipe, crankcase, and fuel tank including unburned hydrocarbons, carbon monoxide, oxides of nitrogen, particulates, and sulfur.
Emissions Control
A term used for emission controls.
Emissions Warranty
A federally mandated 5 year/50,000 mile performance and defect warranty that covers all emissions related components on all new vehicles built since 1981. In 1995 the emissions warranty was reduced to 2 years/24,000 miles on all emissions related components except the computer and catalytic converter, which are extended to 8 years/80,000 miles.
The semiconductor material in a transistor that emits carriers into the base region when the emitter base junction is forward biased.
Emulsifiable Chemical
Any chemical that will mix with water.
A fluid substance containing one liquid disbursed and suspended in another, rather than dissolved.
Emulsion Tube
A passage in a carburetor where air is mixed with fuel.
To switch a computer device or facility so it can operate.
A free-flowing clear or pigmented varnish, treated oil, or other form of organic coating that usually dries to a hard, glossy, or semiglossy finish.
Enameled Wire
Wire insulated with a thin, baked-on varnish enamel, used in coils to allow the maximum number of turns in a given space.
An electromagnetic transducer used to produce digital data (code) indicating angular or linear position.
End Clearance
The distance a shaft moves longitudinally as the crankshaft in an engine. Also known as end play.
End Gap
The distance between the ends of a piston ring.
End Gas
The last part of an air/fuel mixture to burn during combustion.
End Play
A term used for end clearance.
To flip a vehicle end over end.
Endurance Limit
The maximum stress that a metal can withstand without failure, after a specified number of cycles of stress.
A race of 6 to 24 hours with emphasis on endurance and reliability rather than speed.
An abbreviation for engine.
The mechanical or automatic coupling of two members, like the driving flywheel and pressure plate, to rotate and drive the driven disc of a clutch.
Engagement Chatter
A shaking, shuddering action that takes place as the driven disc makes contact with the driving members makes contact with the driving members caused by a rapid grip and slip action.
A device that burns fuel to produce mechanical power; to convert heat energy into mechanical energy.
Engine Bay
The area in a vehicle occupied by the engine.
Engine Block
A term used for cylinder block.
Engine Configuration
Relating to the style and type of engine, such as V-8, pancake, and so on.
Engine Cooling Fan
A term used for cooling fan.
Engine Cooling System
A term used for cooling system.
Engine Displacement
The volume swept within an engine as its cylinders make one stroke, generally expressed in cubic inches, cubic centimeters, or liters.
Engine Dynamometer
Device to measure engine horsepower at the flywheel.
Engine Dyno
A term used for engine dynamometer.
Engine Fan
A bladed device found at the front of the engine used to draw air through the radiator and across the engine.
Engine Identification Number (EIN)
A code to identify the type of engine found stamped on the cylinder block.
Engine Idle Compensator
A thermostatically controlled device on the carburetor that prevents stalling during prolonged hot weather periods, while the air conditioner is operated.
Engine Overhaul
To perform more than minor repairs on a powerplant, though not as extensive as an engine rebuild.
Engine Paint
A paint specially formulated to withstand engine heat.
Engine Rebuild
To perform an extensive engine repair including machining, reboring, and honing to factory-stock specifications.
Engine Thermal Switch
An electrical switch designed to delay the operation of a system in cool weather to allow time for the engine coolant to warm up.
Engine Thermostat
A temperature-sensitive mechanical device found at the coolant outlet of an engine that expands (opens) or contracts (closes) to control the amount of coolant allowed to leave the engine, based on its temperature.
Engine Torque
A rotating, twisting action developed by the engine that is measured in pounds, feet, or kilowatt hours.
Engine Tuneup
The inspection, testing, and adjusting of an engine; the replacement of any parts required to ensure maximum performance.
Engine-Coolant Temperature (ECT)
The temperature of the coolant in an engine.
Engine-Coolant Temperature Sensor (ECTS)
An electronic or electro-mechanical unit for sensing engine-coolant temperature.
Engine-Management System
An electronic device that monitors, adjusts, and regulates the ignition and fuel-injection systems to maintain engine control under varying operating conditions.
Engineering Plastics
Thermoset and thermoplastic materials, such as polycarbonate, ABS, and nylon. Their characteristics and properties enable them to withstand mechanical loads, such as tension, impact, flexing, vibration, and friction, combined with temperature changes, making them suitable for application in structural and load-bearing product design elements.
Englishtown (E-Town)
A town in New Jersey; the site of the annual NHRA Summernationals.
Environmental Hazards Management Institute (EHMI)
An educational organization that provides materials to teenagers and adults relative to responsible management and recycling of hazardous waste materials.
Environmental Protection Agency (EPA)
An agency of the United States government charged with the responsibility of protecting the environment and enforcing the Clean Air Act of 1990.
An abbreviation for extreme pressure.
EP Lube
A term used for extreme-pressure lubricant.
An abbreviation for Environmental Protection Agency.
A plastic compound that is often used to repair cracks and small holes in metal.
Epoxy Cement
A durable thermosetting adhesive.
An abbreviation for evaporator pressure regulator.
Equal Length Headers
An exhaust system having equal length tubes from each cylinder to the collector.
A device in the brake-cable system that prevents one side from being applied before the other.
The tube that balances pressure between two exhaust pipes.
Equalizer Line
A small-bore line used to provide a balance of pressure from one point to another, as in a thermostatic expansion valve.
Equipment and Tools Institute (ETI)
An organization of equipment and tool manufacturers, jobbers, and wholesalers.
Erasable Programmable Read-Only Memory (E-PROM)
A special PROM that can be erased under high-intensity ultraviolet light, then reprogrammed.
Ergonomic Hazards
Conditions that relate to one's physical body or to motion.
The science of adapting the workplace to the worker, as in the cockpit of a race car to the driver.
An abbreviation for electronic spark control.
A series of s-shaped bends in a race course.
An abbreviation for electronic spark timing.
The person who determines the cost value of the damage, plus the price required to repair the damaged vehicle, working with insurance adjusters or appraisers.
An abbreviation for experimental safety vehicle.
An abbreviation for elapsed time.
The localized attack of metal surfaces causing pitting and/or deterioration.
C2H6, a minor component of natural gas used as a fuel.
A form of alcohol, C2H5OH, found in alcoholic beverages and also used as an additive in gasoline to produce gasohol.
The trade name for tetraethyl lead, a fuel additive no longer permitted due to environmental hazards.
Ethyl Alcohol
A term often used for ethanol.
Ethylene Glycol
The basic chemical used in automotive antifreeze; mixed with water for cooling-system protection and to increase the boiling point of the coolant.
An abbreviation for Equipment and Tools Institute.
A custom styling treatment to provide a European flair.
To create a vacuum within a system to remove all traces of air and moisture.
A service procedure using a vacuum pump to remove all atmospheric air and moisture from inside an air-conditioning system.
An abbreviation for evaporator.
The transformation of a liquid to the vapor state.
Evaporation Control System (ECS)
A system that prevents fuel vapors from escaping to the atmosphere while the engine is off.
Evaporative Emissions
Hydrocarbons from fuel that evaporate from a vehicle's fuel tank and carburetor; eliminated by sealing the fuel system and using a charcoal canister to trap vapors from the fuel tank and carburetor.
Evaporative-Emissions Control (EEC)
A canister filled with activated charcoal to reduce raw fuel emissions.
Evaporative-Emissions Control System (EECS)
A system to reduce the amount of raw fuel vapors that are emitted into the ambient air from the fuel tank and carburetor.
The heat exchanger of an air-conditioning system that removes heat from the air passing through it.
Evaporator Control Valve
Any of the several types of suction pressure-control valves or devices used to regulate the evaporator temperature by controlling its pressure.
Evaporator Core
The tube and fin assembly located inside the evaporator housing, where refrigerant fluid picks up heat when it changes into a vapor.
Evaporator Equalizer Valves-in-Receiver
A term used for valves-in-receiver.
Evaporator Fan
A fan used to move air across the evaporator and heater core.
Evaporator Housing
The case that contains the evaporator core, diverter doors, duct outlets, and blower mounting arrangement.
Evaporator Pressure Regulator (EPR)
A back-pressure regulated temperature-control device used on some early Chrysler car lines.
Evaporator Pressure-Control Valve
A term used for evaporator control valve.
Evaporator Temperature Regulator
A temperature-regulated device used by early Chrysler Air-Temp systems to control the evaporator pressure.
Even Fire
A V–6 engine with a 60- or 90-degree block having individual journals on each crankshaft throw staggered in relation to each other to provide even firing.
An abbreviation for except.
A word referring to an omitted category or item.
Excess Flash
A term used for flash.
Excessive Crush
A condition that exists when a pair of bearings are installed in a bore that is too small, causing them to deform and leading to early failure.
Exhaust Analyzer
An automotive test and service device that uses a process involving infrared energy to determine and display the composition of an engine's exhaust gases such as the two-gas type to measure hydrocarbons and carbon monoxide or the four-gas type, which also measures oxygen and carbon dioxide.
Exhaust Back Pressure
The resistance of the free flow of gas in the exhaust system.
Exhaust Emissions
Pollutants identified by clean-air legislation as being harmful or undesirable, including lead, unburned hydrocarbons, carbon monoxide, and oxides of nitrogen.
Exhaust Gas
The burned and unburned gases that remain after combustion.
Exhaust Headers
A term used for exhaust manifold.
A special exhaust manifold with tubes of equal length from the exhaust ports to the header of the exhaust system.
Exhaust Manifold
A component, generally of cast iron, with passages of unequal lengths that carry the exhaust gases from the exhaust ports to the header of the exhaust system.
Exhaust Pipe
A pipe that connects the exhaust manifold, the muffler, or catalytic converter.
Exhaust Port
In a rotary combustion engine, peripheral opening in the rotor housing that allows the burned gases to leave the engine.
Exhaust Stroke
The upward motion of the piston forcing burned gases out the open exhaust valve.
Exhaust System
The tubing, mufflers, and catalytic converters that direct exhaust gases from the engine to the atmosphere.
Exhaust Valve
Valve that, upon opening, allows the burned gases to leave the combustion chamber during the exhaust stroke.
Exhaust-Gas Oxygen
The amount of oxygen present in the exhaust stream, as measured by an oxygen sensor and reported to the computer in closed-loop, feedback systems to aid in the control of the air/fuel mixture.
Exhaust-Gas Recirculation (EGR)
An emissions-control system that reduces an engine's production of oxides of nitrogen by diluting the air/fuel mixture with exhaust gas so that peak combustion temperatures in the cylinders are lowered.
Exhaust-Gas Recirculation Valve (EGR valve)
A valve, generally vacuum operated, to regulate the exhaust gas flow into the intake manifold.
Exhaust-Gas Speed
The speed at which exhaust gases pass through the header pipes, usually at about 200-300 feet (61-91 meters) per second.
A chemical reaction, such as combustion, that gives off heat.
Expansion Control
The grinding of a piston in a slightly oval shape so that it becomes round when it expands with heat.
Expansion Plug
A term used for core plug.
Expansion Tank
A coolant-recovery tank.
An auxiliary tank, usually connected to the inlet tank or a radiator, that provides additional storage space for heated coolant.
Expansion Tube
A metering device used at the inlet of some evaporators to control the flow of liquid refrigerant into the evaporator core.
Expansion Valve
A term used for thermostatic expansion valve.
Experimental Safety Vehicle (ESV)
A prototype vehicle used to test and evaluate specific safety features.
Explosion-Proof Cabinet
Cabinet used in the automotive shop to store gasoline and other flammable liquids.
Exposure Limit (EL)
A term often used for permissible exposure limit (PEL).
Extension Housing
An aluminum or iron casting that encloses the transmission output shaft and supporting bearings.
External Combustion Engine
An engine that burns the air-fuel mixture in a chamber outside the engine cylinder, such as a steam engine or a Stirling engine.
External Equalizer
A term used for equalizer line.
External In-Line Filter
Filter placed in the transmission-cooler return line outside the transmission housing.
A supplemental filter placed in the air-conditioning system to prevent system damage after repairs.
Externally-Tabbed Clutch Plate
Clutch plates having tabs around the outside periphery to fit into grooves in a housing or drum.
Extra Capacity
A coupling device that has strength capability greater than standard.
A fluid reserve system.
Extreme Pressure (EP)
A much higher-than-average pressure condition.
Extreme Pressure Lubricant
An API-rated lubricant for heavy loads.
Extremely Hazardous Substance (EHS)
Any substance or the by-product of any substance that is poisonous or contains carcinogens considered unsafe, in any concentration, for humans, animals, or plant life.
To make a visual estimation or determination.
The light beam that operates an electronic, race-timing system.
Eyewash Fountain
An emergency water fountain that directs water to the eyes for flushing and cleaning.® ©2001- 2020  AutoZone, Inc. All Rights Reserved.