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Anti-Fouler

A device installed on a spark plug in an oil-burning engine to reduce the fouling of the plug.

Anti-Icers

Chemicals added to gasoline to prevent it from freezing. Typically an alcohol such as ethanol, methanol, or isopropyl alcohol.

Anti-Knock Additive

A compound that may be added to gasoline to increase its octane, thereby decreasing its knock.

Anti-Knock Index

The average of the motor octane number (MON) and the research octane number (RON); a measure of fuel's anti-knock characteristics.

Anti-Lock Brake

A type of braking system that senses the speed of each wheel and, in conjunction with a computer, controls the hydraulic braking pressure, thereby eliminating wheel lockup.

Anti-Lock Brake Control Module

The computer used to control an anti-lock braking system.

Anti-Oxidant

A substance that prevents or slow down oxidation of plastic material that is exposed to air and the elements.

Anti-Percolation Valve

A device used to prevent fuel from evaporating from the fuel bowl of a carburetor while the engine is running. It is connected to the throttle linkage, so it is closed when the throttle is open, and open when the throttle is closed. With the engine off, hot fuel vapors boil out through the vent line and into the charcoal canister.

Anti-Rattle Hardware

Clips, springs, and washers to prevent disc pads or brake shoes from rattling and vibrating.

Anti-Rool Bar

English term for Sway bar.

Anti-Rust Additive

A solution that is added to coolant to retard rust formation inside a cooling system.

Anti-Seize Compound

A thread compound designed to protect threaded connections from damage due to rust or corrosion.

Anti-Siphon System

A small passage in a carburetor to prevent fuel from siphoning from the float bowl into the engine.

Anti-Skid Control

Accessory for the brake system that operates on rear wheels, or all four wheels, to prevent wheel lockup during braking. Braking pressure is reduced to wheel(s) that are about to lock up and skid, by electronic controls.

Anti-Smog Device

A part or parts designed to reduce or eliminate vehicle exhaust emissions.

Anti-Squat

Suspension geometry that will resist a vehicle's tendency to drop or squat on the rear springs when accelerating.

Anti-Static Agents

Treatment used during, and/or after the molding process to minimize static electricity in plastic materials.

Anti-Sway Bar

A suspension component, often called a sway bar, intended to prevent side-to-side body movement in relation to the axles and wheels.

Anti-Theft System

Deterrent systems designed to scare off would-be car thieves by sounding alarms and/or disabling the ignition system. Common components used in an automobile anti-theft system include an electronic control module, door switches at all doors, trunk key cylinder switch, hood switch, starter inhibitor relay, horn relay and alarm.

Antifreeze

A chemical solution added to thee coolant (water) to prevent freezing; usually ethylene glycol and anticorrosion chemicals. Ethylene glycol resists evaporation, but the anticorrosion elements in the antifreeze may be used up in one year, depending on the amount and type of driving.