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Emergency Brake
A braking system, independent of the main hydraulic system, that can be used to slow or stop the car if the primary brakes fail, or to hold the car stationary though the brake pedal is not depressed.

A braking system, independent of the main hydraulic system, that can be used to slow or stop the car if the primary brakes fail, or to hold the car stationary though the brake pedal is not depressed.

Engine Speed
The revolutions per minute (rpm) at which the engine crankshaft turns.

Electronic Ignition
An ignition system using electronic switching devices to relieve the mechanical breaker points of part of their duties, or replace them.

Exhaust Emissions Control
Systems or adjustments designed to limit noxious gases in an engine's exhaust. Such controls can be grouped into two broad categories: those designed to reduce or eliminate the formation of harmful pollutants in the engine itself (retarded spark settings are one example) and those designed to destroy or otherwise alter the pollutants after they have been formed.

Exhaust Emissions
Unburned hydrocarbons, carbon monoxide, oxides of nitrogen and other noxious gases emitted when gasoline is burned in an engine.

Exhaust Manifold
An assembly of tubes that attaches to the cylinder head and provides a series of passages through which burned gases from the engine cylinders can flow to the exhaust system.

Exhaust Stroke
The fourth stroke of a four-cylinder cycle, in which the piston moves upward from bottom dead center to top dead center, pushing the burned exhaust gases out of the cylinder.

Exhaust System
The pipes, resonators and mufflers that carry the exhaust gases from the exhaust manifold out into the atmosphere.

Exhaust Valve
A camshaft-driven valve in the cylinder head that opens to allow burned gases out of the cylinder and closes to form part of the combustion chamber during the compression and power strokes.

Expansion Plug
A steel plug, slightly dished or cup-shaped. When driven into place it flattens to fit tightly in its seat. In an engine block, expansion plugs (also called freeze plugs or core-hole plugs) are inserted into the holes in the casting through which core was removed when casting was formed. They open into cooling passages and thus provide pressure relief should the engine coolant freeze and expand.

Expansion Tank
A separate tank, partly filled with coolant, that connects to the radiator cap in a sealed cooling systems. As the coolant in the engine is heated it expands and a portion is sent into the expansion tank. Then when the engine approaches operating temperature, a valve in the radiator cap closes, sealing the cooling system, and the valve opens, allowing coolant in the expansion tank or reservoir to flow back into the radiator. This keeps the cooling system filled at all times.

Expansion Valve
A part of an air-conditioning system, located between the condenser and the evaporator, that regulates the flow of liquid refrigerant to the evaporator.

External Combustion Engine
An engine that burns its fuel outside the engine. Steam engines are external combustion engines.

Principally a machine that converts electrical energy into mechanical energy.

Early Termination
A vehicle's depreciation is highest in the first few months after it leaves the dealer's lot. Since a lessee pays for depreciation in equal monthly payments, lessees who end a lease early have almost always used up more of a car's value than they've paid for. Therefore, lease contracts generally include penalties for early termination. Be aware of these penalties before you sign the lease contract and consider your ability to fulfill the contract.

End-Of-Lease Purchase Price
If there is a purchase option in the lease contract or agreement, this will be the agreed upon price for the purchase of the vehicle at the end of the lease-the stated residual value. This price may also include additional fees.

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