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ECC  abbreviation for Electronic Climate Control

EEC An abbreviation for: 1. Evaporative emission control. 2. Electronic engine control.

EGR system  The EGR system (Exhaust Gas Recirculation system) is designed to reduce emissions. To be precise, it lowers the amount of nitrogen oxide (NO) in the exhaust emissions. Nitrogen oxide is formed at very high combustion temperatures. What the EGR system actually does is direct part of the exhaust gases back into the intake manifold, which in turn helps reduce the combustion temperature and consequently lower the amount of NO in the exhaust gases. The EGR flow is controlled by the engine computer which opens or closes the EGR valve depending on the operating conditions. One of the most common problems related to EGR is the intake passage or the EGR valve getting clogged with carbon deposits causing restrictions to the EGR gas flow. This turns the "check engine" light on and sets the code PO401 - insufficient EGR flow (this is a common problem for the Acura / Honda V6 engine, for example). This problem happens mostly if a car makes only short trips so it can't warm up fully, or when the oil is not changed regularly.

EGR Valve The Exhaust Gas Recirculation (EGR) valve sends some of the
exhaust gas back into the cylinders to reduce combustion temperature. 

This is required because nitrous oxides (nasty pollutants) form when the combustion temperature gets above 2,500 degrees F. This is as a result of the formation of nitrous oxides when the nitrogen in the air mixes with the oxygen.

 When it's sunny, the nitrous oxides from the exhaust get together with the hydrocarbons in the air to form smog. This is when the EGR valve comes in handy. By recirculating some of the exhaust gas back through the intake manifold to the cylinders, we can lower the combustion temperature. Lowering the combustion temperature lowers the amount of nitrous oxide produced. Consequently, less of it comes out the tail pipe. There are two types of EGR valves. One operates through the use of a vacuum, and the other operated through the use of pressure. Both types allow the exhaust gas in to lower the combustion temperature when it gets too high.

ELC abbreviation for Electronic Level Control

Electric-Drive Cooling Fan
1. An engine-cooling fan driven by an electric motor.
2. An electrically controlled fan that cycles ON and OFF with the air conditioner control, if predetermined system and/or ambient temperatures are exceeded.

Electric Fuel Pump  Used previously for heavier vehicles, they have only recently become operational in cars. The replacement types usually use a diaphragm arrangement like the mechanical pumps, except that it is actuated by an electrical solenoid. It uses a small turbine wheel driven by a constant speed electric motor. The entire unit is located in the fuel tank and submerged in the fuel itself. When the engine is running the pump pump operates continuously, thus exerting a constant pressure which supplies the maximum fuel demands of the engine. When less fuel is required, the pump does not deliver at full potential, because the turbine is not a positive displacement type like the mechanical pump. Consequently, the turbine will run without pumping fuel and so, needs no means of varying fuel delivery rate like its mechanical counterpart. Since the fuel can flow past the spinning turbine blades, there is no need for pump inlet and outlet valves nor is there any need to vary its speed. A relay for the electric fuel pump is used to complete the circuit to the fuel pump. This cuts off current to the fuel pump in the event of an accident.

Electric Motor A device which changes electrical energy into rotational motion. In addition to the starter and windshield wiper motors, which were the first electric motors to be added to the automotive electrical system, modern cars include a large number of small motors for driving such items as the electric windows, aerials, sunroofs, mirrors and seat adjustment, central locking and power hoods; electric-powered cars use large motors for their drive.

Electronic Climate Control (ECC) A system used to regulate the temperature and humidity of a vehicle's cabin.

Electronic Control Module  (ECM)

[1] The master computer responsible for interpreting electrical signals sent by engine sensors and for activating automated engine components and processes accordingly in order to produce optimum performance.

[2] A GM term and also a generic term referring to the computer. The ECM is the brain of the engine control system receiving information from various sensors in the engine compartment. The ECM calculates what is required for proper engine operation and controls the different actuators to achieve it Also called "electronic control unit"

Electronic Level Control (ELC) A device that automatically regulates the ride height of a vehicle under various load conditions.

Electronic Fuel Injection  Injectors are opened by solenoids operated by an electronic control unit, as opposed to mechanical injection systms. Since the fuel has no resistance to overcome, other than insignificant friction losses, the pump pressure can be set at very low values, consistent with the limits of obtaining full atomization with the type of injectors used. The control unit, depending on the operating conditions of the engine, determines the amount of fuel to be injected. The conditions depend on manifold pressure, accelerator enrichment, cold-start requirements, idling conditions, outside temperature and barometric pressure. The systems work with constant pressure and with 'variable timed' or 'continuous flow' injection. The advantages. To begin with, it has fewer moving parts, no need for ultra-precise machining standards and quieter operation. Also, there is less power loss, a low electrical requirement, no need for special pump drives, no critical fuel filtration requirements, no surges or pulsations in the fuel line. More than anything else, it costs lesser than its mechanical counterpart.

Electrical System  In electric ignition internal-combustion engines, those components required to convert the electricity produced by the generator into a high-voltage spark for the plugs. Includes: generator or alternator, points, condenser, coil, distributor and spark plugs plus wiring.

Emissions  The exhaust that comes out of a vehicle's tailpipe or tailpipes. Harmful emissions are reduced on most newer vehicles (except diesels) through the use of a catalytic converter. Cats are designed to reduce the amount of hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx) that exit a vehicle and are therefore vented into the atmosphere. Other kinds of pollution-reduction devices have been used on cars and trucks over the years, including a positive crankcase vent valve, a charcoal canister and an air injection reactor pump.


A device for changing fuel energy to mechanical energy. The term applies to the primary source of power generation.

The gasoline engine transforms the heat produced from burning gas into a rotating force.

Shown below are parts within the engine.
Do you see how many rotating and moving parts it has?

 All of them need lubrication to last longer. That's why it's very important to change the engine oil as often as the owner's manual recommends.

Also known as Motor

Learn ALL about The Internal Combustion Engine Here!

Engine Types

  • F-Head Side exhaust valve and overhead inlet valve. 

  • L-Head Both valves on one side of the cylinder. 
  • T-Head Exhaust valve on one side and inlet valve on the other side of the cylinder. (Twin-camshafts).
  • I-Head Both valves located directly over the piston. Also called valve--in-head or overhead valve engine.
  • SOHC Single overhead camshaft. 
  • DOHC Double overhead camshafts. 

Engine Block  See The cylinder block.



The system of exhausting the burned gases from an internal-combustion engine consisting of piping or tubing, silencers, and, at times, resonators.

Exhaust Emission Controls 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 (e.g., retarded spark setting) and those designed to destroy or otherwise alter the pollutants after they have been formed (e.g., air injection, thermal reactors, and catalytic converters). Evaporative emission controls prevent gasoline vapors from escaping into the atmosphere from the fuel tank and carburetor and crankcase controls recycle fumes from the crankcase through the engine.

Exhaust Manifold  A part with several passages through which exhaust gases leave the engine combustion chambers and enter the exhaust pipe.

Usually constructed of cast iron, the exhaust manifold is a pipe that conducts the exhaust gases from the combustion chambers to the exhaust pipe. It has smooth curves in it for improving the flow of exhaust. The exhaust manifold is bolted to the cylinder head, and has entrances for the air that is injected into it. It is usually located under the intake manifold.

Exhaust System Tubing and other components that move the engine's waste products (aka exhaust gases) from the engine to the tailpipe. Most late-model vehicles feature an exhaust system with one or two exhaust manifolds, at least one catalytic converter and one or two mufflers. Race vehicles may use a "straight-through" exhaust, which does not have a catalytic converter or a muffler. See dual exhaust.

External Combustion Engine: An engine that burns its fuel outside the engine. A steam engine is an external combustion engine.


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The objective of this Web Page is to familiarize you with basic auto maintenance
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not to make you an expert in auto mechanics

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