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Mechanic's Wire

Bendable steel wire used to attach or fasten parts or other objects together.

Mechanical Fade

Brake fade due to heat expansion of a brake drum away from the shoes and linings. Mechanical fade does not occur with disc brakes.

MECS

Mazda equipped control system or Mazda engine control system.

Mega

The prefix representing the number 1,000,000.

Mega Samples Per Second

A sample rate unit equil to one million samples per second.

Megahertz

(MHz) One million cycles per second.

Megnetic Reluctance

The resistance of a magnetic path to the flow of magnetic flux lines through it.

Megohm

(M0) A million Ohms.

MEM-CAL

Memory Calibration Package.

Membrane

1. The separating layer in a fuel cell that acts as an electrolyte, as well as a berrier film separating the gases in the anode and cathode compartments of the fuel cell.

Menu

A list of choices for selecting a confifuration or feature.

Metal Deactivator

Gasoline additive used to neutralize the effect of copper compounds found in gasoline.

Metallic Lining

Break friction material made from powered metal that is formed into blocks by heat and pressure.

Meter Mode

Setting an oscilloscope to display digits as with a multimeter.

Metering Device

A device for metering the proper amount of refrigerant into an evaporator. The two types for automotive air conditioning systems are thermostatic expansion valve (TXV) and orifice tube (OT).

Metering Valve

A hydriodic control valve used primary with front disc breaks on RWD vehicles. The metering valve delays pressure application to the front brakes until the rear drum brakes have started to operate providing better control and stopping power.

Methanol

(methyl alcohol, wood alcohol) Typically manufactured from natural gas. In the 1980's methanol was used in combination with heavier co-solvents alcohols as an octane enhancer for addition to gasoline. Methanol is not typically blended into today's gasolines, however methanol is being considered as a "neat" (pure) fuel in specially designed vehicles.

Mfd

Micro-farad.

MFI

Mechanical fuel injection, or Multi-port fuel injection.

Mg

Magnesium An element with the atomic number of 12.