- D -

De-ice Switch

A switch used to control compressor operation to prevent evaporator freeze-up.

DE-MOSFET

(depletion-enhancement metal oxide semiconductor field effect transistor) This transistor can be operated in either a depletion or enhancement mode.

De-Port

An intake or exhaust port shaped like the letter D.

Deactivate

A series of steps necessary to turn a feature or function off.

Dead Axle

A shaft, such as the rear axle on a front-wheel drive vehicle, that connects wheels to either side of a vehicle but does not provide driving power.

Dead Center

The extreme top or bottom of the piston stroke.

Dead Player

A vehicle part or assembly that is inoperable.

Dead Short

A zero resistance short circuit.

Dead Spot

The momentary loss of power in an engine while increasing its speed.

Dealership

A privately owned sales and service facility representing an automobile manufacturer.

Deburr

To remove sharp edges from a part.

DEC

Diesel electronic control.

Decarbonize

To remove carbon deposits. Also known as decarburize.

Decarburize

Same as decarbonize.

Decel Valve

A device that reduces exhaust emissions during vehicle deceleration by keeping RPM up and vacuum down.

Decelerate

To decrease speed.

Deceleration

1. A decrease in velocity or speed. 2. To allow the vehicle to coast to idle speed from a high speed.

Deceleration Valve

A device used withy the dual-diaphragm, vacuum-advance to advance engine timing under deceleration conditions.

Dechrome

1. To strip the vehicle of chrome for modification. 2. To remove the chrome prior to body repair and/or painting.

Deci

The prefix representing the number 0.1.