Automobile ignition systems rely on perfect timing. A simple spark, when delivered at precisely the right moment, can mean the difference between a smooth running and powerful engine that operates cleanly and an engine that runs rough, lacks power and produces unnecessary emissions. How much do you know about automobile ignition systems? See more »

Researchers in Japan have developed a new method of auto theft deterrent that verifies the driver's identity. Are you comfortable with your car seat knowing this much about you? See more »

The next time your car won't start and you're cursing the battery, you might want to blame the alternator, too. This coconut-sized car part works with the battery to generate power for your vehicle. See more »

Other HowStuffWorks articles explain the mechanics of the engine and many of its subsystems, including the fuel system, cooling system, camshafts, turbochargers and gears. But the ignition system is where it all comes together, with a perfectly timed spark. See more »

A car engine produces so much heat that there is an entire system in your car designed to cool the engine down to its ideal temperature and keep it there. But cooling systems serve other purposes too.  See more »

Has your fuel gauge ever read "empty" when you know there are gallons left in your auto's tank? Learn all about how fuel gauges work and how to know when "Empty" means "No seriously get gas." See more »

As engines and their electronics become more complex, spark plugs remain accessible and easy to understand. It doesn't take long to figure out the inner workings of a spark plug. See more »

We can already use biological markers to identify people, but within the next decade, similar technology is coming to our cars, too. Will this be yet another distraction for drivers? See more »

Wires fuses and connectors are the kind of thing in your car that you never think about, but they are essential. They're not just there to keep your radio and lights working! Learn why they are so important. See more »

The difference between hot and cold spark plugs lies in their ceramic insulation. Learn how hot and cold plugs are different in ignition systems in this article. See more »