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Ignition Retard

The moving back in time of the ignition spark relative to the position of the piston.

Ignition Switch

A five-position switch that is the power distribution point for most of the vehicle's primary electrical systems. The spring loaded START position provides momentary contact and automatically moves to the RUN position when the key is released. The other switch detent positions are ACCESSORIES, LOCK, and OFF.

Ignition System

The major components, such as the battery, coil, ignition switch, distributor, high-tension wiring, and spark plugs, that provide the right spark at the right time to ignite the air/fuel mixture.

Ignition Temperature

The lowest temperature at which a combustible material will ignite and continue to burn independent of the heat source.

Ignition Timing

The timing of the spark, expressed in crankshaft degrees, in relation to top dead center.

Ignition Timing-retard Sensor

A term used for knock sensor.

IHC

International Harvester Corporation.

IHP

An acronym for indicated horsepower.

IHRA

An acronym for the International Hot Rod Association.

IKF

An acronym for the International Karting Federation.

ILC

Idle load compensator or idle load control.

ILM

1. Acronym for Indicator Lamps Module (Ford).

IM

Ignition module.

IM240

Inspection and maintenance test.

IMACA

An acronym for International Mobile Air Conditioning Association.

IMCA

An acronym for International Motor Contest Association.

IMEP

An acronym for indicated mean effective pressure.

IMHO

Computer speak (In My Humble((Honest)) Opinion.

Immobilizer

The system in the automobile that keeps the vehicle from engine opperation by anyone but the athorized opperator. A required system in Germany.

IMO

Computer speak (In My Opinion).