Become an expert on all things motoring! This dictionary of terms and phrases will help you understand exactly what things are, what gets done and why.

Definitions starting with I

  • Idle Speed

    The idle speed is how fast the engine runs when the car is not in gear and your foot is off the accelerator. Most cars idle just enough to keep the engine going, between 600 and 1,000 RPM.

  • Idler Pulley

    The idler pulley helps regulate the way your car belts run. The bearings in the pulley wear out over time from regular use, but can easily be replaced.

  • Ignition System

    The ignition system starts your engine when you turn the key. A burst of high voltage to the spark plugs from the ignition coil ignites the fuel/air mix in the engine, beginning the combustion. The coils, modules, sensors, and spark plugs are also part of the ignition system.

  • Intake Manifold

    The intake manifold is a series of tubes that distribute air and fuel to the cylinder head from the carburettor or fuel injector. If you have a leak in your intake manifold, the air/fuel mix can become lopsided and the internal combustion operates less efficiently. A poor idle or sluggish acceleration is an indicator of a leaky intake manifold.


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