MAF – Mass airflow sensor

This term refers to a section of the fuel injection mechanism that notifies the computer as to how much fuel should be injected.  The mass airflow sensor reacts to how much fluid is passing through a chamber, but is designed not to detect how dense the fluid may be.  This part of the fuel injection mechanism functions by measuring how much air is flowing to engine and sending a signal to the computer to inject a certain amount of fuel.

Man – Manual

This term describes an instruction manual or an owner’s manual that is a booklet of instructions on how to work a machine or how to operate a system.  A manual is usually presented when purchasing a vehicle, appliances for the home and office, and computer systems.  A car manual includes vital information about how the devices inside and outside of the vehicle are operated and has warnings and precautions from the manufacturer.

MFI – Multi-point fuel injection (electronic)

This term refers to a type of fuel injection system that is mounted nearby the intake ports of each cylinder to enhance fuel dissemination and to reduce off-putting emissions of exhaust.  Multi-point fuel injection functions electronically by injecting fuel upstream of each cylinder’s intake port, instead of injecting fuel at the center point within an intake port.  There are three types of multi-point fuel injection: batched, where fuel is injected without being synced up with any specific cylinder’s intake stroke; simultaneous, where fuel is injected simultaneously to all of the cylinders; and sequential, where fuel is injected in timed sequences to match each cylinder’s stroke; this system is sometimes called port injection.

MFI-C – Continuous multi-point fuel injection (electronic)

This term refers to a type of electronic fuel injection system in which fuel is flowing from the fuel injectors constantly at all times.  Rather than delivering fuel during short, varied spurts, continuous multi-point fuel injection allows fuel to flow continuously.  This system functions by controlling the rate at which fuel is disseminated to uniformly deliver the fuel to injection lines to the intake ports of the individual cylinders.

MFI-I – Intermittent multi-point fuel injection (electronic)

This term refers to a type of electronic fuel injection system in which fuel is flowing from the fuel injectors intermittently rather than continuously.  In intermittent multi-point fuel injection, a multi-point circuit feeds injection of fuel into the intake port at certain intervals. Diesel engines have used this mode of fuel injection ever since they were first introduced.

MFI-S – Sequential multi-point fuel injection (electronic)

This term refers to a type of electronic fuel injection system that initiates each injector nozzle independently of the others.  With sequential multi-point fuel injection, spurts of fuel are timed so that they spray the fuel right before or right as the intake valve opens.  Unlike other basic multi-point fuel injectors that operate several injectors that spray all of their fuel simultaneously in groups, sequential multi-point fuel injection allows fuel to be injected in timed sequences to match each cylinder’s stroke.

MG – Morris Garages

The MG Car Company Limited was previously a British automobile manufacturer that was founded in 1924 by a man named Cecil Kimber.  This company was widely acknowledged for its two-seat sports vehicles, but Morris Garages also manufactured coupe style cars, saloons, vans, concept cars, and racing cars. Headquartered in Oxford, United Kingdom, MG is a wholly owned subsidiary of SAIC Motor, but the cars are still marketed under the MG marque.

MOD – Manual Over-Drive

This term refers to a mechanism that permits a motor vehicle to drive at a maintained speed with lowered engine RPM.  The result of manual overdrive is enhanced fuel efficiency, lowered noise, and less likelihood of wear and tear.

MOT – Ministry of Transport Test

This term refers to a yearly automobile safety and standards test.  The Ministry of Transport test checks automobiles for different elements of exhaust emissions that are required to be met by cars more than three years old.  There are testing centres where certificates are issued for automobiles that pass the minimum criterion.  MOT certificates are issued by either the Vehicle and Operator Services Agency (VOSA) in Great Britain or the Driver and Vehicle Agency (DVA) in Northern Ireland.

MPFI – Multi-point fuel injection (electronic) or Multi-port fuel injection

This term refers to a type of electronic fuel injection system that is currently included in all recently built motor vehicles.  Multi-port fuel injection delivers flexible and reliable intake manifold designs which are a key component that makes this fuel injection strikingly efficient.  MPFI functions by including a fuel injector at each individual cylinder right above the intake port.  Then, the intake manifold becomes a controller of the amount of air that is permitted to flow into the engine.

MPG – Miles per Gallon

This term describes the the distance that is travelled in a motor vehicle in relation to one gallon of gasoline or diesel fuel.  Miles per gallon measures a vehicle’s fuel efficiency by calculating the ratio of the total number of miles driven in regard to the total number of gallons the vehicle has used. MPG is a standard metric unit that calculates how many miles a motor vehicle can drive per one gallon of gasoline or fuel.

MPH – Miles per hour

This term describes the rate of a motor vehicle’s speed in relation to one hour.  Miles per hour is a measurement that calculates how many miles a vehicle can drive in one hour of time.  MPH is the ratio of the miles traveled to the amount of time spend driving in terms of hours.

MPI – Multi-point injection, fully electronic engine control

This term refers to a type of fuel injection system with fully electronic engine control.  In this system, the fuel injection atomizes the fuel by coercively pushing fuel through a small nozzle under high pressure. Multi-point fuel injection has basically replaced carburetors to enhance fuel dissemination and to reduce off-putting emissions of exhaust.  Multipoint fuel injection functions electronically by injecting fuel upstream of each cylinder’s intake port, instead of injecting fuel at the center point within an intake port.

MPV – Multi-purpose vehicles

This term refers to a large, van-like motor vehicle that is fashioned to hold eight passengers at maximum capacity.  Multi-purpose vehicles are made to travel in all sorts of conditions and on various types of terrain, including off-road terrain.  To be considered an MPV, four wheels of the vehicle must be in direct contact with the ground at all times; this type of vehicle is commonly referred to as a “people-carrier” due to its extensive amount of passenger space.

MY – Model Year

This term describes the year when a certain product was made and is a number that is used around the world.  There are two stipulations that determine the model year: the future design revisions must not have been produced in the past, and the product must be built to the design revision that was the most recent at the time of building.  The design revision number points out the base specification of the product.