- M -

MPI

Multi-point injection.

MPSI

An abbreviation for Micro Processor System Integrations Company. A manufacturer of automotive scantools and other electronic equipment.

MPU

Micro processor unit.

MS

An abbreviation for military standard.

MSDS

An abbreviation for Material Safety Data Sheet. Information sheets issued by the manufacturer of hazardous materials. An MSDS provides detailed information concerning any dangerous ingredients, corrosiveness, reactivity, toxicity, fire, or explosion danger data.

MSM

Abbreviation for Memory Seat Module (Chrysler) (GM).

MSMM

Abbreviation for Memory Seat and Mirrir Module (Chrysler).

MTA

Managed thermactor air.

MTBE

An abbreviation for methyl tertiary butyl ether. An ether manufactured by reacting methanol and isobutylene. The resulting ether is higher in octane and lower in volatility. MTBE is a fuel oxygenate and is permitted in unleaded gasoline up to a level of 15%.

MTEG

An abbreviation for Mickey Thompson Entertainment Group.

Mud And Snow Tire

1. An all-season tire. 2. A term used for snow-and-mud tire.

Mud Flap

A flap hanging down behind a tire to prevent the tire from throwing debris against the lower panel of the vehicle or into the path of a following vehicle.

Mud Plug

A cap installed in the center of a wheel to keep out mud and other debris.

Mud-Bogging

Racing an off-road vehicle through a 100-200 foot (30-61 meter) mud hole.

Muffler

1. A hollow, tubular device used in the lines of some air conditioners to minimize the compressor noise or surges transmitted to the inside of the car. 2. A device in the exhaust system used to reduce noise.

Muffler Bearing

A non-existing part.

Muffler Clamp

A clamp that secures the muffler, or pipe, to the bracket or hanger.

Muffler Hanger

A hanger that is used to secure the muffler.

Mule

1. A yard tractor not suitable for over-the-road service. 2. A road race car used for practice or testing.

Multec Injector

An injector that is designed with a high degree of anti-clogging qualities.