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I

Intensity, or Iodine An element with the atomic number of 53.

I-4

An acronym for an inline four-cylinder engine.

I-6

A term used to identify a six-cylinder in-line engine.

I-beam

A I-shaped design that is used for both connecting rods and suspension components.

I-beam Axle

A beam axle having an I-shaped cross section.

I-beam Rod

A connecting rod having an I-shaped cross section.

I-head

An overhead valve engine having both intake and exhaust valves directly over the piston.

I-head Engine

An overhead valve engine with the valves in the head..

I.d.

An acronym for internal diameter or inside diameter.

I/M

An acronym for inspection maintenance usually referring to state emissions inspection and testing programs.

I/M 240

A 240-second emissions-inspection program that used loaded-mode testing that simulates the federal urban test cycle for certifying new vehicle-emissions performance.

I/O

Input/Output.

I4

A term used to identify a four-cylinder in-line engine.

IABM

Acronym for Integrated Airbag Module (GM).

IAC

Idle air control or inlet air control.

IAC-BPA

Idle air control bypass air.

IACV

Idle air control valve.

IAM

Idle air management.

IAT

An acronym for intake air temperature sensor.

IATN

The largest network of automotive technicians in the world This group of over 45,000 professional automotive technicians from 129 countries gather to exchange technical knowledge and information from around the globe. with an experience base of more than 924,690 years of experience (see www.iatn.net for additional information).