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EMR

Emission maintenance reminder or electronic module retard.

Emulsifiable Chemical

Any chemical that will mix with water.

Emulsion

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.

EMW

Emission maintenance warning.

Enable

To switch a computer device or facility so it can operate.

Enable Criteria

The exact conditions necessary for a diagnostic test or OBD-II monitor to run.

Enamel

A free-flowing clear or pigmented varnish, treated oil, or other form of organic coating that usually dries to a hard, glossy, or semigloss 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.

Encoder

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

1. The total amount of axial play in an automatic transmission. Endplay is typically measured at the input shaft. 2.A term used for end clearance.

Endo

To flip a vehicle end over end.

Endplay

The measured amount of axial movement in a shaft.

Endurance Limit

The maximum stress that a metal can withstand without failure, after a specified number of cycles of stress.

Enduro

A race of 6 to 24 hours with emphasis on endurance and reliability rather than speed.

Energized

Having the electric current or source turned on.

Energy

The capacity for performing work.